Reborn in the Shark Storm

Finn chartered a yacht with his fiancée Ruby and old classmates for an island trip. A violent storm struck, followed by a brutal great shark attack. In the critical moment, Ruby chose her secret lover York over Finn, pushing him into the sea where he fell prey to the shark. Now, Finn awakes aboard the cruise ship, the day before their island arrival. Armed with foresight, how will he exact his revenge?