Helicoprion

A series of violent shark attacks off the shores of northern California draw the attention of pessimistic Detective Luke Jansen. Despite reports of shark sightings, by witnesses, the injuries appear to be more reminiscent of a chainsaw-welding maniac rather than shark bites. Things get stranger when marine biologist Elise Sheldon encounters the creature and claims that the beast is a Helicoprion, thought to be extinct. Luke and Elise form an unlikely alliance to uncover the truth which puts them face-to-face with a violent man-eating shark, and the terrifying reason for its existence.