In this time of economic and financial crisis, times are tough for everyone. Precariousness pushes some people to seek solutions that they sometimes think they find illegally. As a result, business is increasing in the police station in the suburbs of Nantes in which Commander Kreusky works, at the head of a team of ten people. Hiding her skin-deep sensitivity under a disillusioned appearance, she tries to keep the ship afloat. She has to navigate with discernment between the theft of vegetables in a garden, the pick-pocketing of a prostitute and the assault of a granny by two teenagers.

Everybody goes out on Saturday nights. Teenagers are bored and get drunk. Sometimes things go wrong. Binge drinking leads to an alcoholic coma. Even parents are out of their minds. Everybody shows up at the police station. The night will be long, very long.

An epidemic of flu has emptied the police station. There is a small riot in the suburbs at the Cité des Muguets. Fighting turns into rubbish bin throwing. The police has a hard time waking up a drunk who fell asleep in his car while his daughter is crying on the back seat.

Things go wrong quickly. An arrested boy tries to commit suicide in the police station. His father gets very angry, but the family is acting so weird that Kreusky and her team decide to dig deeper. The drug deal in the Cité has brought the narcotics at the Police station.

It's Christmas Eve. The Christmas tree is in the cafeteria, everything's fine. Except that an ordinary man decides to burglarize a small jewellery store. He takes the saler as a hostage. A school teacher is worried about her son. She accuses her sister of locking him up.

A flagrante delicto ordered by the Chief officer goes wrong. Lieutenant Karine shoots. Too hastily. The whole story started because of Pascal, the unlucky guy who opened a French Fries House near the police station. Hold up by the cops, hold up by the Cité, he is about to commit suicide.

Two teenager girls fall for the same guy and are torn apart. Until they realize he betrayed them with a third girl, who is not even from the city. The decide to take revenge.