New York City private eye P.J. (Peter Joseph) Detweiler needs the work, so he accepts an offer to be a bodyguard to protect Maureen Preble, the mistress of shady millionaire William Orbison.
Orbison takes the family to the Bahamas, where a romantic attachment between P.J. and the married Maureen seems to be growing. Orbison's business partner, Grenoble, is shot dead and P.J. is arrested by the police. It becomes clear to P.J. that he has been set up by the Orbisons, who wanted to rid themselves of Grenoble and needed a fall guy.
P.J. is released by the authorities and makes it back to New York, where he confronts the masterminds of the plot. About all he can do is stand by as Orbison and his mistress end up doing away with one another.
Victor Frankenstein, a cold, arrogant and womanizing genius, is angry when his father forbids him to continue his anatomy experiments. He ruthlessly murders his father by sabotaging the old man's shotgun, consequently inheriting the title of Baron von Frankenstein and the family fortune. He uses the money to enter medical school in Vienna, but is forced to return home when he impregnates the daughter of the Dean.
Returning to his own castle, he sets up a laboratory and starts a series of experiments involving the revival of the dead. He eventually builds a composite body from human parts, which he then brings to life. The creature goes on a homicidal rampage until it is accidentally destroyed when a vat where it has been hidden is flooded with acid.
Jim "Lucky" Moore (Allan Jones), an insurance salesman, comes up with a novel policy for his friend, Steve (Robert Cummings): a 'love insurance policy', that will pay out $1-million if Steve does not marry his fiancée, Cynthia (Nancy Kelly). Encouraged by Jim's argument that Jim has never had to pay out on a policy so that the marriage is a sure thing, Steve accepts.
The upcoming marriage is jeopardized by Steve's ex-girlfriend, Mickey (Peggy Moran), and Cynthia's disapproving Aunt Kitty. The policy is underwritten by a nightclub owner, Roscoe (William Frawley), who sends two enforcers – Abbott and Costello – to ensure that the wedding occurs as planned.
Everyone involved in the situation winds up sailing or flying to San Marcos (a fictional South American country), where another complication arises, when Lucky falls for Cynthia. Lucky winds up marrying Cynthia, but Roscoe does not have to pay the $1-million because Steve ends up marrying Mickey.
