In this chilling horror-thriller, a gang of lusty, partying college kids hijacks a billionaire's yacht for a midnight cruise. Onboard, sensible Jess (Alexia Fast, Jack Reacher) meets hunky Brady (Jesse Metcalf, John Tucker Must Die), a corporate spy posing as a mechanic. Near a mysterious island, an evil "ninth passenger" slips on board and starts slaughtering the party crowd. Jess and Brady find evidence of the gruesome scheme behind the killings... but are they already in over their heads?