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He is broken out by Mieli, an Oortian warrior, and her sentient ship Perhonen, working for the Sobornost goddess Joséphine Pellegrini. The price of his freedom is a heist on the Oubliette, the walking Martian city where he once hid his own memories from himself.
Once a mind can be scanned and duplicated, a single person becomes an unlimited labor supply. The Sobornost forks uploaded minds into gogols, copies that are edited and conditioned to perform specialized tasks and then traded, enslaved or deleted. When copies are cheap, a mind stops being a protected individual and becomes a commodity input, and the copy's consent can be engineered rather than obtained.
In the Oubliette, every citizen controls through cryptographic gevulot exactly which memories, perceptions and even facial details others may access, and each exchange sets its terms. Privacy is enforced by the architecture itself, down to what another person is able to perceive or remember about you, rather than by norms or law. The same machinery that protects individuals lets a society hide things collectively, and a thief can exploit it to hide things from himself.
Oubliette citizens spend Time as money, and a person whose Time runs out becomes a Quiet. The Quiet are minds housed in mechanical bodies that do the city's hard labor and keep it alive before their owners can return to human life. Death is converted into a debt paid in servitude, so mortality itself becomes the economy's enforcement mechanism and labor pool.