Detective John Penley and his new partner, Detective Paula Newberry, of the Sacramento Police Department are tasked with leading the investigation into a local serial killer who has dumped three bodies in the past six weeks --- and all of them are missing their internal organs. But while pursuing a lead, the detectives stumble upon a personal message the killer left behind for Penley. And it's attached to a human kidney. How could the killer know that Penley's son is on the kidney transplant waiting list? Now Penley is baited into an impossible trap that could jeopardize his entire career.