The anonymous caller has an unnerving message about something "real dead... burried in your marsh.". The eco-volunteer on the other end of the line thinks it's a prank, but when a young woman's body turns up in L.A.'s Bird Marsh preserve, no one's laughing. And when the bones of more victims surface, homicide detective Milo Sturgis realizes that the city is in the terrifying grip of an insidious killer. Milo's first move: calling in psychologist Alex Delaware.