Suspecting his wife Janine of having an affair, Charles Jensen hires private eye Johnny Merak to follow her. Merak learns that Jensen had divorced his first wife Arlene - who has since disappeared... Convinced that Jensen had arranged Arlene's murder, Arlene's sister, also approaches Merak to investigate. Ignoring warnings to drop his investigations, he's knocked unconscious, and wakes next to a woman's corpse - a woman who has been shot with his gun. Then the police arrive...