 On Valentine s Day 20 years before, an explosion of methane gas took the lives of a group of miners working in the Hanniger Mine. The accident occurred because supervisors left their posts to attend the annual Valentine s Day dance. A year afterward, Harry Warden - the only survivor of the accident - retaliated by killing the two supervisors, and leaving a terrifying warning never to hold another Valentine s Day dance. Now, a group of young adults decides to hold another dance, despite warnings. When a blood-soaked heart arrives at the police station, accompanied by an ominous message, the dance is cancelled. But a Valentine party is held in its place, and it isn t long before the town s young people begin dying violently. It appears Harry Warden has returned to punish those who did not heed his warning...