A police brigade works in the dangerous northern neighborhoods of Marseille, where the level of crime is higher than anywhere else in France.

Bill Baker, an American oil-rig roughneck from Oklahoma, travels to Marseille to visit his estranged daughter, Allison, who is in prison for a murder she claims she did not commit. Confronted with language barriers, cultural differences, and a complicated legal system, Bill builds a new life for himself in France as he makes it his personal mission to exonerate his daughter.

Fed-up with his violent daily life, former Marseilles police officer Alex Hugo leaves the city and the violence he can no longer bear.