The bodies fished out of San Francisco Bay were a puzzle, with no sign of how they died. Then toxicologist Caleb Maddox uncovers an unspeakable horror connecting them all, suggesting the work of a deranged killer. And he's starting to wonder if the mysterious beauty he's become obsessed by could be the link between the victims. Plunged into a nightmare where love, madness and murder are clasped in a lethal embrace, untangling the truth could be the last thing Caleb ever does.