Dr. Scarpetta is confronted with a complex case involving the disappearance of a paleontologist from a dinosaur dig in the remote wilderness of Canada. The only clue—a disturbing video—finds its way to Scarpetta's inbox in Boston. As she delves into the investigation, she uncovers a series of interconnected crimes, including a gruesome murder and inexplicable tortures, all linked by trace evidence from the last living creatures of the dinosaur age. The case becomes even more personal as Scarpetta discovers that the danger and suspicion have infiltrated her closest circles, including her niece Lucy, her lead investigator Pete Marino, and her FBI husband Benton Wesley. Feeling alone and betrayed, Scarpetta is drawn into a perilous pursuit of a cunning and cruel killer.