A young man paying the rent for himself and his lifelong friends ends up flat-broke and resorts to selling marijuana to pay the bills – only to get caught up in the dangerous world of drugs.

Times have changed a lot for Franck who is a night watchman. About a decade ago he was a specialized worker. Today he feels bored but would jump at any chance to prove his bravery and courage.

Newly transferred to the bustling port city of Marseille to assist with a crackdown on organized crime, energetic young magistrate Pierre Michel is given a rapid-fire tutorial on the ins and outs of an out-of-control drug trade. Pierre's wildly ambitious mission is to take on the French Connection, a highly organized operation that controls the city's underground heroin economy and is overseen by the notorious —and reputedly untouchable— Gaetan Zampa. Fearless, determined and willing to go the distance, Pierre plunges into an underworld world of insane danger and ruthless criminals.

Paulette lives alone in a housing project in the Paris suburbs. With her meager pension, she can no longer make ends meet.

Tony Roucas, a long-term convicted criminal, escapes from prison with Kenz, a small-town big shot. Their run reveals a generational conflict of a new genre. Tony’s quest for truth and desire for vengeance take you to the heart of great French organized crime, from the 50s to today.

In a rural setting on the weather-beaten French Atlantic coast, the ten year old daughter of a single mother is implicated in murder. Crime scene evidence contradicts the story of the talented, introverted child as expressed in her Mangas.

Freddie is starting as a thug for Jazdec the Polish, a pimp and concealer of illicit goods. Freddy's love for Larna, whom he dreams to snatch from prostitution, drive them into jeopardy under the clutches of a Chinese Godfather. To see Larna alive, Freddie must kill the so-called Mr. Zhu, a strange Chinese Zorro who just arrived in Paris to retrieve a young runaway fellow countrywoman.

A mild-mannered banker is forced to masquerade as a notorious gangster and pimp.

In France, terrorist groups and intelligence agencies battle in a merciless war everyday, in the name of radically opposed ideologies. Yet, terrorist and secret agents lead almost the same lives. Condemned to secrecy, these masters of manipulation follow the same methods. Alex and Al Barad are two of them. The former is the head of the D.G.S.E.'s (Direction Générale de la Sécurité Extérieure, the French equivalent of the CIA or the MI6) counter-terrorism unit while the latter reigns over a terrorist network, and both fight using the most ruthless of weapons: human beings.

Marek, a crime squad officer, sets out to avenge the death of his partner and best friend, who was killed by drug traffickers. He asks for a posting to a new undercover unit created to infiltrate a drug gang that imports hashish from Morocco using the "Go Fast" method. A fleet of high-powered speedboats and cars races across the Mediterranean to Spain and then France, loaded with drugs.

The series follows the adventures of lighthearted Jean-Paul Moulin, a police Commissaire, and his team as they solve crimes.