In 1894, French Captain Alfred Dreyfus is wrongfully convicted of treason and sentenced to life imprisonment at the Devil’s Island penal colony.

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.

A robber escapes from prison with a single objective in mind: to track down his former cellmate, a serial killer who intends to pin his crimes on him. A cop is sent after the robber who, despite his best efforts, soon becomes Public Enemy Number One. As the protagonists are driven to their limits, it becomes increasingly unclear who is the hunter and who is the prey.

A Parisian criminal gang fall apart after challenges to the gang's leader lessen his influence.

A briefcase with undisclosed contents – sought by Irish terrorists and the Russian mob – makes its way into criminals' hands. An Irish liaison assembles a squad of mercenaries, or 'ronin', and gives them the thorny task of recovering the case.