 Joe Rogers goes undercover in order to expose a murderer named Mrs. Gillespie. He believes that she has been killing her husbands for insurance money. He discovers that Mrs. Gillespie has a fiancé and plans to marry again. He also discovers that she has taken out a large insurance policy on him. Later, Mrs. Gillespie runs off on another honeymoon. Joe meets another man who happens to be investigating Mrs. Gillespie s fiancé. Apparantly, he has had four previous wives, each of whom died under mysterious circumstances.