Driving to the El Patio club to see his girlfriend Fausta Moreni, the establishment's proprietor, private investigator Manville Moon does not expect to be witness to a murder. As he steps from his car outside the club, he hears a gun suddenly roar from the bushes close behind him. Walter Lancaster, the lieutenant governor of the neighbouring state of Illinois, has been shot! The assassination will not only make headlines all over the country, but also place the lives of Moon and Fausta in deadly danger...