The Secret Service guarded Thurman before the catastrophe; Darcy now thinks he once belonged to it.
Secret Service agents guarded Thurman during his visit to Kramerbooks and maintained protection near his treatment chamber, still wearing suits and shades. As memories of his earlier life return, Darcy thinks he joined the Secret Service after briefly serving in the army.
The agents guarding Thurman’s treatment area wore suits and shades.
A protective service associated with Thurman and with Darcy’s uncertain recollections of his former career.
Also appears in books you've already read — spoiler-safe to their endings: