Looking forward to a relaxing vacation with friends, Lucy returns to her cliffside home in Hawaii after her first year of college. After all, with her father away on business, they have the house all to themselves. However, their reunion takes a dark turn when Ben, the family's beloved chimpanzee, begins to show strange aggression. As Ben becomes an unpredictable threat to humans, Lucy must find a way to escape the raging primate and survive the night. But what good is fighting back when pinned down by a brutal force of nature?