While enjoying a day of exploring at the beach, Megan Lambert, a lifeguard at Aqua World, discovers a shark's tooth - one that belongs to a shark with an evil past. Now, wearing it as a necklace, she is forced to pull a late shift with her boss. Party plans canceled, her friends decide to bring the party to her. Only, the party turns into a nightmare where the park flows with blood, and there is one uninvited guest.
