Some 30 years after Altered Carbon, Takeshi Kovacs is now serving in Carrera's Wedge, a mercenary organisation which joins a corporate war on a distant colony, Sanction IV, and fights the rebellion against the corporate-sponsored government. While having his latest body repaired after a disastrous campaign, Kovacs is approached by pilot Jan Schneider, who is looking for protection for an expedition to exploit a Martian artefact discovered just before the war broke out. "Martian" artefacts have been known for many years at this point, one of them being featured in Altered Carbon. Later it is realised that the "Martians" were not from Mars, but were a technologically advanced species that left artefacts on many planets, including Mars and Kovacs' home world.