The Quantum Thief
The titular thief is Jean le Flambeur who is freed from the Dilemma Prison, a virtual jail of a group known as the Sobornost. The person who frees him, Mieli, is a warrior from the Oort cloud whose employers, the pellegrini, want him to steal something. In order to do that, he has to retrieve his previous memories hidden in the Oubliette, one of the Moving Cities of Mars. Meanwhile, in the Oubliette, Isidore Beautrelet is a detective who has been hired to prevent unwanted guests at a party hosted by the millenniaire Christian Unruh. One of those gatecrashers may be le Flambeur.