Nine years ago, Sam watched her friend drown. The water, and the fact that Sam couldn't save her, has haunted her ever since. Now, as Sam gets ready for varsity pre-season on the swim team, she vows not to let the fear of the water bring her down. But when the upperclassmen take the girls to the abandoned neighborhood pool called the Graveyard, a seemingly harmless prank will set off a catastrophic chain of events.