A man in a Santa suit and a woman meet in an alleyway to have sex in a car, and are stabbed to death by a man wearing a grinning translucent mask. During a party, another man dressed like Santa Claus has a spear thrown through his head, and dies in front of his daughter, Kate Brioski. At New Scotland Yard, Chief Inspector Ian Harris and Detective Sergeant Powell discuss the murders, and interview Kate, and her boyfriend Cliff. That night, another Santa is killed, having his face shoved onto the grill he was roasting chestnuts on an open fire.