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-wielding maniac rather than shark bites.

Things get stranger when marine biologist Elise Sheldon encounters the creature. Exhausted and traumatized, she is quickly dismissed after she makes the claim that the beast is a Helicoprion. Thought to be extinct, the creature wields a spiraling set of teeth that can dice anything caught in its path. Unable to convince anyone of its existence, Elise turns to Detective Jansen for assistance.

With little help from the police department, Luke and Elise form an unlikely alliance to uncover the truth. Their investigation puts them face-to-face with a violent man-eating shark, and the terrifying reason for its existence.