Paris Police Commissioner Edouard Coleman is able to detach himself from the gruesome and morbid details of the cases on which he works. He demands the respect of those with who he works, he not afraid to use his position to get what he needs from his associates or the supposed perpetrators. He is a night owl by necessity as that's when most of his life's major crimes occur. He is also somewhat detached from the notion that his friend, nightclub owner Simon, knows that he is cheating with his girlfriend, Cathy, the two men who remain friends and who do not talk about it. One of the cases on which he is currently working is a bank robbery in the provincial seaside town of Saint-Jean-de-Monts. It is known that four men committed the robbery, one who was seriously wounded in the process. What Edouard is unaware of is that Simon is one of the four, the mastermind in his methodical and calculating approach to his criminal work, and that Cathy knows and is thus an accessory. The dichotomy that is Edouard and Simon's lives also have the potential to converge when Edouard receives a tip from one of his snitches, a transvestite show girl at Simon's club named Gaby, she who is trying to avoid Edouard's wrath, that a professional mule coined Suitcase Mathieu will be carrying a cache or heroin across the border on a Paris to Lisbon train, Edouard who plans for the police to intercept Suitcase Mathieu with the goods, while Simon and his gang plan on stealing the heroin en route only to sell it back to the drug lords. In these games of cat and mouse, the question then becomes if Edouard the cat will discover the mouse is Simon and if so if the cat will get his prey including Cathy.