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Tree Gelbman is a blissfully self-centered collegian who wakes up on her birthday in the bed of a student named Carter. As the morning goes on, Tree gets the eerie feeling that she's experienced the events of this day before. When a masked killer suddenly takes her life in a brutal attack, she once again magically wakes up in Carter's dorm room unharmed. Now, the frightened young woman must relive the same day over and over until she figures out who murdered her. Wikipedia