The movie begins with Jess, a young woman who sets sail on a yacht with her friends, celebrating a reunion. However, their joy is short-lived as a violent storm hits, and they become lost at sea. As they try to find their way back to shore, they encounter a mysterious and sinister presence on the yacht. The film's narrative takes a complex turn as Jess finds herself reliving the same terrifying events over and over, with each loop leading to a new and gruesome death.