LA Private Investigator Johnny Merak accepts the diminutive Charles Henning as a client, little realising the danger he will face... But soon, when a series of brutal gangland murders begins, Lieutenant O'Leary, leading the police investigation, is not pleased to find Johnny Merak at each of the murder scenes. And it seems that Henning had been there too! Both the police and Johnny want to question Henning - but the little man has disappeared. And the murders continue.