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The Compendium

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Juliette works in Mechanical.

Bernard Holland

Bernard Holland runs IT.

Jahns tentatively identifies the young IT technician summoned by Bernard as Lukas.

The IT department is circulating Allison’s white paper to help people recover information they accidentally deleted.

Marnes describes Walker as crafty and says he never leaves his workshop.

Mechanical employs Juliette, the deputy’s preferred candidate for sheriff.

Shirly is Marck’s wife.

Deagan Knox is head of Mechanical.

Marnes is Holston’s deputy.

Holston is the silo’s sheriff.

Peter Billings is among the candidates being considered for sheriff.

Holston requests the mayor after entering the holding cell.

An unidentified runner’s footsteps sound on the stairwell below Juliette.

The silo is a buried cylindrical home.

Neighboring Silo

The next hollow contains another sensor tower.

Holston wears a black carbon undersuit beneath the cleaning suit.

The elderly McNeil is associated with Supply.

Marck is a mechanic who guides Marnes and Jahns to the mess hall after his second shift.

Allison was Holston’s wife.

People sent to cleaning are condemned to death.

Mechanical and Supply Uprising

Walker identifies the angry gathering following his suit revelation as the beginning of an uprising.

Scottie trained as a shadow under Juliette, who taught him to preserve electrical ties.

Juliette's Knife

Juliette takes a knife from a rack in the other silo’s kitchen.

McLain was already head of Supply during Jahns’s first term.

Jenkins is among the mechanics Juliette considers recruiting to confront the silo’s leadership.

The silo’s airlock is on the other side of Holston’s office from the cafeteria.

Cleaning Helmet

Holston breathes oxygen circulating within his helmet while the airlock fills with argon.

Bernard directs that Sims top up Jahns and Marnes’s canteens.

Hank is the down-deep deputy on level 120 and has known Juliette for a long time.

Juliette's Diving Suit

Juliette adapts a complete cleaning suit by drilling and threading a hole in its helmet collar for an air hose.

Peter Nichols is Juliette’s father and works at the nursery on twenty.

Juliette reports that the heat tape taken from IT fell apart easily.

Neighboring Silo Staircase

The other silo’s stairwell has working emergency lights that give off a green glow.

The outside view shows lifeless hills.

Central Staircase

The spiral staircase has steel treads and a railing worn by generations of use.

A decaying city skyline is visible beyond the hills.

Juliette's Watch

Juliette consults a timepiece on her wrist that appears to Jahns to be working.

The server room is protected by the most heavily fortified door in the silo.

Lukas’s mother pressures him about missing opportunities in the lottery to give her grandchildren.

The uprising took place a century and a half before Holston’s confinement, according to Jahns.

Upper Cafeteria

The cafeteria at the top of the stairs is one of the silo’s widest rooms.

The cafeteria’s projected outside view is becoming blurred by dirty camera lenses and airborne grime.

Allison retrieves remnants of data that had been deleted and overwritten many times on the silo’s servers.

Holston and Marnes investigated George’s death in Mechanical.

Display Program

Allison reports finding programs used to create realistic screen pictures.

Courtnee is a young plumber who treats Walker kindly when visiting his workshop.

Solo retreats into a hole beneath the server-room floor that is covered by a sliding metal grate.

Juliette's Air Compressor

Juliette is working on a large wheeled air compressor with trailing hoses.

Deputy Marsh escorts Juliette fifty levels from Hank’s station to the mids.

Generator Control Room

The generator control room has a thick door that reduces the machinery’s noise almost to nothing.

The holding cell is usually entered only to clean it unless someone is in custody.

Jahns and Marnes's Canteens

Jahns and Marnes share Marnes’s canteen during their descent.

Bernard calls the hidden material he is showing Lukas their Legacy.

Jahns proposes a power holiday to permit maintenance and commemorate those who clean.

Walker’s workroom

Walker’s shop receives pumps for motor respooling.

Jahns expects the sheriff to take guidance from the Pact.

Sheriff's Office

Holston’s office is between the cafeteria and the silo’s airlock.

The Order makes up the remainder of the enormous book after the Pact.

The generator has a rapidly spinning shaft connecting two huge machines.

Hank’s radio has been disassembled and wired together across Walker’s workbench for examination.

Neighboring Silo Sump Pumps

The pumps Juliette wants to restore are in sump basins at the very bottom of the silo.

A plastic headset is stored in a cloth case fastened inside a server.

Bernard keeps the key to the server case around his neck.

The generator room is so loud that Jahns and Marnes use ear protection.

IT Conference Room

The conference room where IT receives Jahns and Marnes is attached to the main foyer.

Juliette’s ID is rejected by the scanner at IT’s security gate.

Sammi suggested that Lukas replace a server control board.

Sheriff's Badge

Holston leaves his metal star on the desk before entering the holding cell.

Harper was a refinery worker before becoming a soldier.

The wall chart shows evenly spaced circles with internal detail and connecting lines.

Jahns feels guilty about imagining intimacy with Marnes because of the memory of her husband.

Outside Sensors

Cleaning the outside sensors involves wiping their lenses.

The Tragic Historye of Romeus and Juliette

The Tragic Historye of Romeus and Juliette begins with a sword fight.

Jahns and Marnes stop at IT on the thirty-fourth level.

Children's Picture Books

The surviving children’s books depict vivid landscapes and animals that many residents doubt existed.

An IT security worker covers the sheriff’s office while its regular officers are away.

Midlevel Deputy Station

Jahns and Marnes spend the night at the midlevel deputy station during their ascent.

Neighboring Silo Server Room

The other silo’s server room is at least as large as Juliette’s generator room and much larger than the cafeteria.

Main Generator Control Room Operation Manual

The Main Generator Control Room Operation Manual consists of papers bound with brass fasteners.

Juliette’s mother

Juliette’s mother worked as a delivery nurse.

Pieter arrives at Supply ahead of schedule with members of his refinery crew.

Rickson is the teenage boy who attacks Juliette with a wrench and receives a knife wound in his leg.

Winning the lottery gives a couple a year to try to have a child.

Supply’s entrance is on level 110.

The bazaar occupies all of level one hundred.

Solo identifies the diggers as machines that excavated the silo.

Juliette's Ring

The ring in Juliette’s wooden box is a woman’s wedding ring.

Mechanical Barricade

The barricade seals Mechanical’s security entrance from floor to ceiling and wall to wall.

Neighboring Silo Mechanical

The silo schematic shows a room jutting from Mechanical that Juliette does not recognize.

Neighboring Silo Suit Lab

The Suit Lab has better workbenches and equipment than Juliette had in Mechanical.

Pam works in the cafeteria and helped Juliette settle into her new apartment.

Supply has made two dozen heavy cylindrical bombs.

Walker’s note tells Juliette the truth is a joke and says they are good in Supply.

Backup Generator

The backup generator is being dismantled to replace its gaskets.

Blasting-Cap Transmitters

Walker says blasting-cap transmitters from the mining storehouse can enable the radio to transmit.

The down deep begins at level ninety-seven and comprises the silo’s bottom third.

Lukas's Star Chart

Lukas’s chart is a large sheet of paper marked with dots, grid lines, and small notes.

Mechanical Mess Hall

Mechanical’s gate guard suggests that Jahns and Marnes wait in the mess hall until Juliette finishes work.

Neighboring Silo One-Hundred-Thirty-Sixth Landing

Level 136 is the last dry landing above the flood.

Neighboring Silo Supply

Juliette intends to collect additional materials from Supply for a new project.

Supply has manufactured forbidden guns for the planned attack.

The wool scrubbers attach to the front of the cleaning suit.

Down-Deep Deputy Station

The down-deep deputy station is near the center of its forty-eight-floor precinct.

Fifty-Seventh Level

Level fifty-seven is an apartment floor.

George's Case File

The closed file on Juliette’s former lover contains many notes in Holston’s handwriting.

Shirly describes the mines as farther down than the mechanics’ living and working area.

Silo One is the destination Bernard contacts to report Juliette’s disappearance from view.

The lounge adjoins the cafeteria at the top of the staircase.

Elise is the younger girl sheltering beside the teenage mother.

Heat-Tape Blanket

The blanket is made with heat-tape strips whose edges are sealed using a torch.

Neighboring Silo Airlock

A corpse is caught in the gap between the other silo’s partly open outer doors.

Silo One Contact

The man on the headset has a deep, hollow voice and questions Lukas about his duties.

The older girl tells Juliette that the children’s parents are dead.

Juliette's Wooden Box

Juliette’s belongings include an ornate antique wooden box a little larger than Lukas’s palm.

Alice researches Juliette at Jahns’s request before the trip.

Neighboring Silo IT

The other silo’s IT department is on level thirty-four.

Nursery on Twenty

The nursery on twenty enforces quiet with oiled door hinges and signs demanding silence.

Scottie's Data Drive

Scottie’s data drive is hidden at the bottom of a box of cookies.

Thirty-Fifth-Level Room

The hidden area on level 35 cannot be reached by the stairs.

Two Younger Boys

Juliette estimates the two younger boys to be ten or eleven years old.

Eighth-Floor Dirt Farm

The remains of Holston’s parents supplied nutrients to the eighth-floor dirt farm.

Fifty-Sixth-Level Hydroponics

Farmers at level fifty-six lower power cables over the railing to draw electricity from the landing below.

Holston's Case File

Holston’s case file contains extensive notes on his last days as sheriff but only a short account of his offense.

Juliette's Multi-tool

Juliette uses the smallest pick on her multi-tool to release an electrical tie without breaking it.

Bernard says he knew Lukas’s father and considered him a good man.

Neighboring Silo Sheriff's Office

The other silo’s sheriff’s office contains a pile of largely intact bodies.

Scottie's Printout

Scottie’s printout contains the strange computer text Juliette sent to Mechanical.

The surface camera tower is a concrete structure about eight or nine feet high.

Young Mother's Baby

The baby is a girl only a few months old.

Blasting Powder

The delegation transports heavy sacks of blasting powder toward Supply.

Nelson is the head of the cleaning lab.

Electrical trained Marck as a shadow before Juliette arrived.

Holston and Allison's Lottery Ticket

Holston keeps carrying the ticket he and Allison won in the year of her death.

IT’s defenders use guns that continue firing while their levers are held.

Jack Brent was put to cleaning eight years before Holston’s confinement.

Peter Billings works in Judicial a few floors below the upper cafeteria.

Mama Jean makes the oatmeal and cornflour cookies in Juliette’s package.

Mechanical Bunk Room

Jahns and Marnes are staying in Mechanical’s bunkhouse.

Mid-Level Nursery

Juliette’s parents worked together in the old mid-level nursery while her father was an intern.

Operation Fifty of the World Order

Operation Fifty of the World Order admits Lukas Kyle when he is designated successor to silo eighteen’s leadership.

Porters carry heavy loads up the stairs to meet increased post-cleaning demand.

Knox uses a large blueprint on the wall to plan the approach to Supply.

Juliette used the tool lock-up to teach herself motor rewiring during her initiation.

the office at the address in the suicide alert

Scottie’s office contains a cot that appears recently used.

The upper gardens are hydroponic farms.

Neighboring Silo Lower Farms

The lower farms have been supplying Juliette and Solo with food for weeks.

Samson is a young porter who trained under Gloria.

Neighboring Silo Thirty-First-Level Dirt Farm

The dirt farm below the hydroponics level still has running machinery and dripping water.

Nelson heads the cleaning lab.

Dr. Nichols’s son was to be named Nicholas after his paternal great-grandfather.

Robber Cave Experiment

The account Lukas reads describes experimenters posing as camp counselors at Robber Cave.

Solo’s father was apprenticed to the head of IT.

George (bazaar worker)

One database match for George is a thirty-two-year-old bazaar worker whose occupation is recorded as “other.”

Holston and Allison's Apartment

Holston and Allison live in a condo that has been subdivided only twice over the decades.

Jackson is a dog living among Supply’s stacks who seeks attention from Knox.

Juliette's Pipe Flask

Juliette makes a water flask from a broken piece of pipe capped at one end.

Margaret is a nurse who receives Jahns and Marnes at the nursery.

Mechanical Levels

Mechanical’s upper entrance is at level one-forty.

Neighboring Silo Cafeteria

The other silo’s cafeteria receives dim green light from the stairwell’s emergency lights.

Neighboring Silo Uprising

Solo dates the fighting that drove him into hiding to thirty-four years earlier.

The oil well’s pump is on level one-forty-two.

Pumps in the deep pits run constantly to prevent water from filling half the silo.

An unidentified voice answers Walker’s attempt to contact Juliette.

Upper Gardens Guest Rooms

The gardens’ guest rooms are a level below the dining area.

Allison's Recovery Program

Allison has devised a process for recovering deleted and overwritten information.

The theater has sloping rows of benches and seats overlooking a stage.

Bobbie Milner is a shadow no older than sixteen who waits beside Lukas with the defenders.

Carl promises to bring a file after another speaker warns that a cleaning is scheduled for the next morning.

Caryl has transferred from third shift.

The history Lukas reads describes the Civil War as a four-year conflict that consumed thirty-four states.

Clarke is Emma’s husband.

Connor (cafeteria worker)

Connor is one of the cafeteria workers restraining Allison.

Connor (porter)

Connor is a teenage porter with a strong back and steady stride.

Deputy Roberts is described over the radio as searching for clues with her kit.

Emma picks up chalk and crayons while children play in the cafeteria.

Garment District

The garment district produces multicolored coveralls and supplies Jahns’s yarn.

George (Mechanical worker)

One current database match for George is an older Mechanical worker.

Gloria is a neighbor of Marnes whom Juliette recognizes from school recess in the cafeteria.

Gloria (porter)

Gloria, the porter under whom Samson trained, is dead.

Juliette recovers in the infirmary on level thirty-three.

Jahns's Knitting

Jahns keeps paired wooden knitting needles in a leather pouch.

Juliette's Mechanical Room

Juliette’s old room contains a small display terminal and keyboard on a wall rack.

Marcha is a dark-haired, bright-eyed teenage girl apprenticing in IT.

Marnes's Apartment

Marnes’s apartment is four flights below the sheriff’s office, on the level beneath Juliette’s apartment.

Murphy is a sheriff candidate whom Bernard considers too old for the job.

Neighboring Silo Deputy Station

Juliette has slept in the deputy station’s holding cell during supply runs.

Neighboring Silo Sump Room

The sump room contains a central pit marked with water-depth numbers.

Neighboring Silo Thirteenth-Level Nursery

The nursery on level thirteen is dark, with stagnant air smelling faintly of decay.

Neighboring Silo Thirtieth-Level Hydroponics

The hydroponic farms on level thirty are dark and contain rotted plants hanging from suspended pipes.

Pickens ate a neighbor’s pet rat.

Rebecca is Peter’s mother and works in the nursery.

Rhoda was an experienced delivery nurse whom Juliette initially blamed for her brother’s death.

Scottie’s final wire asks Juliette for help getting a transfer to Mechanical.

Bernard says Silo Ten fell after a colleague’s shadow broadcast forbidden knowledge.

Terry is a burly security worker from IT who regularly covers for Marnes and Holston during investigations.

Upper Grade School

The grade school serving the upper third of the silo is directly above the nursery.

Solo shows Juliette a map of land and water to explain the size of the world outside the silos.

A colleague at the deep nursery sends Dr. Nichols occasional news of Juliette.

Juliette initially asks for Doc Hicks, then remembers she needs a doctor near the up top.

Gloria goes to fetch Doctor O’Neil to attend Marnes.

Donna Parkins was put to cleaning twelve years before Holston’s confinement.

Eighty-Second Landing

The eighty-second landing is favored by people jumping to their deaths because of its clear drop to ninety-nine.

The fifty-sixth landing is visible from the fiftieth landing.

George (infant)

One database match for George is an infant less than a year old.

George (older record A)

One deceased George in the down-deep records died in his fifties of natural causes.

George (older record B)

Another deceased George in the down-deep records died in his sixties of natural causes.

George (porter's shadow)

One young database match for George is shadowing a porter.

According to Pieter, Georgie nearly provoked a fight with people questioning the activity near the lower market.

Gloria's Husband

Gloria’s husband helps Juliette support Marnes and lower him onto the bed.

According to Courtnee, Heline said the generator exhaust would be rerouted to IT.

Juliette expects Hendricks to complain if the mechanics check out a rebuilt spare pump instead of repairing the failed one.

Mayor Humphries sought IT approval for nominations before Jahns did.

The ID department supplies photographs from personnel ID numbers.

IT Server Level

The server landing is on the thirty-third level.

Jahns's Case File

The file on Jahns’s death contains testimony and investigative notes.

Mayor Jeffers sought IT approval for nominations before Mayor Humphries did.

Karl is among the workers working on the generator’s exhaust feed.

Kipper’s has a bar in the upper part of the silo.

A larger farm occupies part of the one-thirties above the lower water treatment plant.

Jahns and Marnes pass the lower gardens on their way to Mechanical.

Pieter reports that suspicious people near the lower market challenged the passing workers.

Lower Water Treatment Plant

The lower water treatment plant lies below the larger farm in the one-thirties.

Lukas’s apartment

Lukas leaves his apartment on the morning of Juliette’s cleaning.

Marnes’s suicide note reads “It should have been me.”

Marnes's Pistol

Marnes inspects his gun before the trip down the silo.

McLain's Office

McLain’s office opens onto workshops where weapons are being made.

McNeil is an elderly woman in Supply whom Jahns thinks might also recognize how the silo has changed.

Megan is among the mechanics Juliette considers recruiting to confront the silo’s leadership.

Apartment wings in the mids are being prepared to house detainees.

Mining Storehouse

The mining storehouse contains a foreman’s office with explosives and transmitters in a locked desk drawer.

Neighboring Silo Fifteenth Landing

Juliette uses the fifteenth landing as a sleeping place rather than entering the dark rooms beyond its doors.

Neighboring Silo Fifty-Sixth-Level Hydroponics

The hydroponics on level fifty-six hold enough food and water for the group’s remaining journey.

Neighboring Silo Water Treatment

The pumping system sends floodwater twenty levels upward into empty water-treatment tanks.

Nicholas (Peter's grandfather)

Peter Nichols planned to name his son Nicholas after his own paternal grandfather.

Ninetieth-Floor Farm

The ninetieth-floor farm keeps pigs and other animals whose waste supplies fertilizer.

One-Hundred-Twenty-Sixth-Floor Dirt Farm

Knox considers the dirt farm on level 126 a strategic asset for a fallback at Supply.

Percy restrains Allison’s kicking feet in the cafeteria.

Rachele works first shift and knows Juliette well.

Pieter’s refinery crew replaces its usual black overalls with blue ones to attract less attention.

Rick argues that the cleaner would already have run out of air.

Rick the Plumber

Rick the plumber is Rickson’s father, according to Rickson.

Ricks is among the mechanics Juliette considers recruiting to confront the silo’s leadership.

The history Lukas reads identifies Robber Cave as the site of an experiment involving two groups of boys.

Solo points out silo eight on the map.

Solo describes using a wired apparatus held at his ears to speak with another silo.

Lukas imagines miners from silo eighteen encountering miners from silo nineteen if they dig sideways.

Solo considers silo sixteen a possible origin for Juliette.

Solo points out silo twelve on the map.

Susan has a son who is playing with the other children.

Thirty-Eighth Level

Level thirty-eight houses offices, shops, a plastics factory, and a small water treatment plant.

Thirty-Eighth-Level Pump Control Room

The pump control room contains a computer cabinet that Lukas maintains on Tuesdays.

The up top has no third shift and little second-shift activity beyond dinner service.

Upper Water Treatment Plant

The upper water treatment plant is on level thirty-two.

Judge Wilson supervises Peter Billings as a shadow.

the country of the Americans in the historical account

The historical account says the Civil War killed more Americans than all subsequent conflicts combined.

the plant that processes the oil

A plant a few floors below the oil pump processes the oil to make it ready to burn.