Twenty years ago, a tragic accident in a mine on St. Valentine's Day took the lives of five miners. The disaster occurred while supervisors left their posts to attend the town's annual Valentine's Day dance. The only survivor, Harry Warden, was confined to a mental institution after the ordeal. On the disaster's first anniversary, he returned to the town for bloody revenge. That was nineteen years ago, and memories have dimmed. Young lovers T.J. and Sarah and friend Axel are among the townspeople attending another Valentine's party. Then, a box of Valentine candy arrives, containing an ominous message and a blood-soaked heart. Before the night is over, terror will strike again and again and again.