Detectives Mauro Bruno and Elia Donati, surviving numerous attempts on their lives while bringing Duke Rodolfo Rizzo to justice, decide to take a vacation in Paris to celebrate and relax. However, not long after they arrive Donati is cleverly framed for a murder he didn't commit, but which he finds impossible to refute since the killing was captured on the hotel's camera security system. With Donati in jail, Bruno tries to discover why he's been framed...