Samantha "Sam" Volare catches a shark in Baja, Mexico in a contest. When the stomach is ripped apart by two dogs, human flesh parts spew out and one piece has a "duck" birthmark on it. She is determined to discover who her shark ate. Back in Sandpoint, Idaho, bizarre happenings prevent her from her search. But she persists. Will the killer stop her before she manages to uncover the truth?