Luca, a jobless young man, keeps busy helping his old aunt Ines, a newspaper kiosk owner. One day he answers a phone call which was not meant for him but for a private detective agency. A great fan of crime stories, Luca doesn't hesitate to pass himself off as a private dick by the name of Buldok. As a result, he gets hired by Lamberti, an industrialist in want of money, allegedly to watch his (too) beautiful wife. But it is not long before Luca realizes that he is a plaything of the Lambertis whose actual aim is to murder a rich uncle and lay hands on his money...