> I think there was more than one story in that world
Two separate novels: 'The Peace War' and 'Marooned in Realtime', sold collectively as 'Across Realtime'. Enjoyed them both a lot, but for me 'Marooned...' had a more emotional punch, especially as it becomes clearer what had happened to the victim.
There is also a short story 'The Ungoverned' whose main character is Wil W. Brierson, the protagonist in 'Marooned...'.
Overviews without plot spoilers: 'The Peace War' describes a near-future in which bobbles (apparently indestructible stasis fields where time stands still) are used by 'hacker' types to launch an insurrection against the state. 'Marooned...' is set in the far future of the same world, where bobbles are used to support one-way time travel further into the future, where the few remaining humans try to reconnect following the mysterious disappearance of 99.9% of humanity. Both are high-concept SF, but 'Marooned...' also has elements of police procedural where a low-tech detective (Brierson) shanghaied into his future has to solve the slow murder of a high-tech individual (someone from the far future, relative to him).
Rainbow's End was very good!