In London in the 1970s, Scotland Yard police investigators think they have uncovered a case of vampirism. They call in an expert vampire researcher named Van Helsing (a descendant of the great vampire-hunter himself, no less) to help them put a stop to these hideous crimes. It becomes apparent that the culprit is Count Dracula himself, disguised as a reclusive property developer, but secretly plotting to unleash a fatal virus upon the world.

A chance meeting with a Schlecht agent forces a humble coffee shop manager into the secret world of spies in Swinging London. With the help of his MI5 friend, he poses as the recently dead Major Cavendish who had managed to infiltrate the dreaded organization; he knows that they are intending to assassinate someone - could it be the famous Russian ballerina who has recently arrived for an appearance at Covent Garden?

A member of the English upper class dies, leaving his estate and his business to an American, whom he thinks is his son who was lost as a baby and then found again. An Englishman who thinks he is an Indian comes to believe that he is actually the heir. He comes to hate the American who is his boss, his friend, and the man who has stolen the woman after whom he lusts.

Paul Decker murders his wife in her Italian villa by drugging her milk and asphyxiating her by gas. He cleverly locks the bedroom from the inside and hides inside a trapdoor in the floor until after the body is discovered by servants. He uses a scuba snorkel connected to tubes on the outside to breathe during the ordeal. Decker's stepdaughter Candy suspects him immediately, especially since no suicide note was found. She also is convinced that he murdered her father years before, but her accusations fall on deaf ears. The ruthless Decker even poisons the family spaniel when the pet takes too great an interest in the mask and realizes he will ultimately have to get rid of Candy too.