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In the mining town of Harmony, a drilling accident is caused by the son of the owner, Tom Hanniger. The mine collapses, burying six miners alive. The rescue team finds only Harry Warden alive, but in coma, and the other miners murdered by his pickax, and they conclude that Harry killed them to save oxygen for himself. On Valentine's Day, Harry awakes from his coma in the local hospital, and he kills twenty-two people, including a group of teenagers that are partying in the mine. Harry is killed by the deputy, but the only survivors are Tom Hanniger, his girlfriend Sarah, their friend Axel Palmer and his girlfriend Irene. Ten years later, Tom returns to Harmony after the death of his father. Tom has decided to sell the Hanniger Mine, and finds that Sarah has married Axel, who is now the local sheriff, and they have a son named Noah. On Valentine's Day, Harry Warden also returns...