A man buys a house and comes to believe that not only is the house haunted by werewolves, but a family of vampires lives next door.

When Larry Larkin's comic strip needs some freshening up, he calls in ghost-writer Francis X. Dignan to help him with the strip. Things get complicated when Francis rekindles his love for his ex-wife, who happens to be Larkin's secretary and soon-to-be wife.

When Chester accidentally memorises and destroys the only copy of a secret Russian formula for a new and improved rocket fuel, he and Harry are thrust into international intrigue, trying to stay alive while keeping the formula out of enemy hands.