Megalodon

From publisher blurb: Megalodon Dr. Connor Kirkstrom is a brilliant man, but knows a savage, remorseless killer dwells inside him. Megalodon the Man-Shark, his bloodthirsty Mr. Hyde, is perversely proud of his place at the top of the world’s food chain, considering all other creatures beneath him. Only other sharks are potential peers, and even they must bow to his superior will.