Charon is dead, and though General Wharington's team has deleted all the electronic copies of him, one problem remains: Alpha. Indistinguishable from a woman, Alpha has superhuman capabilities and Wharington's superiors want her dismantled and studied but he believes her behavior is becoming more human. Is she developing emotions, or just learning to counterfeit them?
Determined to solve a series of murders before he retires, detective Salazar turns to Sunil Singh, a South African transplant who specializes in psychopaths, to help determine if a pair of conjoined twins he apprehended are the killers.
The shipwrecked stranger washed up on the beach near Samantha's home turns out to be a half-human experiment by the notorious criminal Charon, a practitioner of illegal robotics with evil plans. Samantha and the man seek help from Sunrise Alley, an underground organization of AIs that have gone rogue.