Zephyr (Hassie Harrison), a solitary, rebellious surfer with a troubled past arrives to Australia's Gold Coast to find an escape, but her peaceful existence is disrupted when she meets and spends the night with fellow surfer, Moses (Josh Heuston). Fleeing to the ocean the next morning, Zephyr is suddenly abducted by Tucker (Jai Courtney), a shark-obsessed serial killer, and held captive on board his boat. Racing against time, she must figure out a way to escape before becoming his latest victim as he carries out a ritualistic feeding to the sharks below.