Gentleman gangster Max and his partner, Riton, pull off their last, most successful heist and find themselves comfortable enough to retire in the style they enjoy. However, Max confides the details of the theft to his younger mistress, Josey -- who has secretly taken up with ambitious young rival gangster Angelo. Angelo then has Riton kidnapped and demands the stash of gold as ransom, which threatens Max's dreams of the perfect retirement.
Victor Le Garrec, a former boxer, runs a gym in Paris while dreaming of finding an aspiring champion who will reach the goals he was never able to achieve.
Antoine Fournier, a language teacher at a secondary school in Lille, was disgraced by four young men he had caught stealing money from a charity collection. Dismissed from the teaching profession, Fournier found a job as a porter in a Monte Carlo palace through his wartime friend Ansaldi. A few years later, when he became the first concierge, the "man with the golden keys", chance brought him into the presence of the young men, married but as Machiavellian as ever. He won't take revenge on them, but their baser instincts will.
At the Conservatory of Vienna the students only have eyes for their beautiful singing teacher, tenor Eric Walter.
Serge, alias Count Fornari, is hired by a mysterious employer to try to steal the Nabob, an exceptionally valuable diamond that Jeannette, alias Aménita (Perrette Pradier), the companion of a billionaire, wears as a locket. She covets the diamond and steals it from the safe. About to be caught in the act, she keeps it hidden in a handkerchief in her hand and manages to conceal it in Serge's pocket during the hotel ball. When she rejoins the billionaire, he asks her to open her hand, but the diamond is gone. The result is a chase full of misunderstandings and twists and turns between the three protagonists.
