It was supposed to be a celebration, but it ends in tragedy. As fireworks explode above them, Evelyn Hardcastle, the young and beautiful daughter of the house, is murdered. But Evelyn will not die just once. Until Aiden, one of the guests invited to the party at Blackheath, can solve her murder, the day will repeat itself, each time ending with the fateful gunshot. The only way to break this cycle is to identify the murderer. However, every time the day begins anew, Aiden wakes up in the body of another guest, and someone is determined to prevent him from ever escaping Blackheath.