One girl's dead. One's in hospital. And one has a secret. Paige, Sarah, Jess and Tallulah were best friends at school. Now they ve begun university and are living together at college, but it s not turning out like it s meant to. Tallulah s partying too hard, Jess is being secretive, Paige is embarrassing herself with an unrequited crush, and Sarah s struggling to keep up with her wealthier friends. One night, Sarah saves Paige from drowning in the university swimming pool. Paige can t remember why she was there, and Sarah s too afraid to say what she thought she saw. Then Jess s body is found outside the college laundry. It s not until Sarah meets the gorgeous and charming Jonny that she can tell someone her suspicions. But what really did happen that night at the pool? And what connects Paige s accident with Jess s death? As Paige starts to piece together her memories, the most terrifying question becomes clear- could it be happening again?