Il caso Sherman

A killer wearing a motorcycle helmet kills financier Lawrence Sherman after breaking into his mansion. Later, the same man accidentally kills a private investigator who was in the company of Henry Sherman, son of the first victim. Nick and Marvin, after narrowly escaping the killer who had just turned the murdered detective's office upside down, begin to interrogate people close to the victims. The two act in collaboration with the beautiful agent Opal Torrance who deals with the Sherman murder...