Jean le Flambeur (flambeur, French, "big-time gambler") was the greatest thief in the solar system.

He was captured by Matjek Chen and incarcerated within the Dilemma Prison, a Sobornost prison located in the Neptunian Trojan belt, He is rescued by Mieli at the behest of Josephine Pellegrini, and tasked to undertake another heist. Clues from his memories lead them to Oubliette, a Moving City of Mars.