Alberto Nardi is a Roman businessman who fancies himself a man of great capabilities, but whose factory teeters perennially on the brink of catastrophe. Alberto is married to a rich and successful businesswoman from Milan, Elvira Almiraghi who has a no-nonsense attitude and barely tolerates the attempts of her husband to keep his factory afloat with her money.

When Gordon Smash tries to get away with the loot from a successful diamond heist, his fellow conspirators shoot him in the back. Smash manages to get a clue to newspaper reporter Robert Foster, who sets of to retrieve the diamonds. Despite becoming a target for the rest of the gang, Foster prefers to rely on fashion model Arabella and news paper photographer 'Flash' instead of the more seasoned Inspector Chandler.

An American narcotics agent is murdered in Italy. The head of the department decides to hire Larry Stanziani, 'The Cobra'. Larry, a former agent and now a third-rate private detective, uses the opportunity to get even with an old enemy, but soon he finds out he's facing a relentless organization