Marco Inaros's Free Navy killed billions and once held Medina—the choke point over every ring gate—backed by the shadowy Duarte behind the Laconia gate. After Fred Johnson died in Marco's ambush, Holden took Medina, and Naomi's discovery of a lethal "wake" in the gates let them lure Marco's entire remaining fleet to annihilation. In the peace that followed, an independent Belter spacing union was founded to govern gate traffic and give the Belt a new purpose, with Michio Pa nominated to lead it, while the Rocinante's crew found their way back to ordinary life and Laconia sealed itself away as a problem for another day.
Recently, the story closes far from any battle, with Anna—the minister from earlier days—aboard the colony ship Abbey, emigrating with her wife Nono and daughter Nami to the world Eudoxia, one small part of the great migration now flowing through the reopened gates. In cramped shared quarters she reads Tolstoy, builds community among believers and atheists alike, and watches Nami wrestle with a school project on what history really is: the work of great individuals, or of impersonal forces of money and land and technology. Nami's instinct—that it is never one or the other, always somebody who does the thing and the conditions that made it possible, like nature and nurture—becomes Anna's meditation on the whole war just ended. History, she decides, is less a machine than a generations-long improvisation. And whether among Earth's teeming billions or scattered across a thousand new suns, humanity is always spending its life together and must learn to be gentle with one another. Maybe, if they can manage that, the stars will be better off for having them.