It's Christmas time and a city is left in shock by a swathe of brutal murders and mysterious disappearances. Then when eye-witnesses report sightings of Saint Nicholas flying over rooftops, it becomes apparent that this will be one Christmas they'll never forget. As the night wears on and the killing escalates, one ex-cop unearths a dark secret, buried deep in church vaults. The beloved Saint Nicholas is revealed as a vengeful killer who, under a full moon on December 5th, begins a reign of terror upon unsuspecting villagers. But when former colleagues scoff at his revelations, he decides to take the law into his own hands to save his city from the bloodthirsty bishop and his deadly revenge.