With a vacation trip to Miami, where she wants to visit her childhood friend Will and his girlfriend Lindsay, young Sara wants to find a week of fun and relaxation. To cheer up Sara, who has become very shy since the death of her parents, Will decides to organize a barbecue party with the friendly residents of the apartment complex. At the party, she meets Zack, a professional model, Kate, a nurse, and Alex. Alex behaves very strangely and urgently warns Sara not to go near the pool. He advises her to leave the building complex as soon as possible. Sara doesn't attach any importance to the words at first, but without knowing how she got there, she finds herself at the bottom of the pool in the middle of the night and is pushed under water by an unknown force. Only by luck does she manage not to drown. Any attempt to leave the building seems hopeless and it quickly becomes clear that she must avoid coming into contact with water at all costs.