Head of company security, Harry Webb (Telly Savalas), fears that a diamond theft is about to take place at a major mining complex deep in the desert. He quickly manages to become very unpopular, particularly with Claire Chambers (Maud Adams), a celebrated cover girl, who is the daughter of the mine administrator. She is visiting the man she loves, Mike Bradley (Peter Fonda), who is responsible for security at the mine. Nelson, the mine administrator, gives Bradley a curious mission – to steal a diamond. He wants to implicate Bradley in order to bring him into contact with a man who is preparing to rob the mine with the aid of a group of mercenaries and a local accessory known as Father Christmas.