Theresa “Tree” Gelbman wakes up on a Monday, September 18th. It’s his birthday. She is determined to take full advantage of this day, but she ignores the town’s invitation received by her father and the gift she received from her roommate, Lori. That evening, during the party, Tree is attracted to a tunnel where she is murdered by a masculine man. Tree wakes up the next morning in Carter’s bed and realizes that the events of the previous day are repeated. She’s going to die again if she can not find the killer first.