The end of the month is hard for everybody : the honests and the dishonests. Thefts, burglaries, petty crimes of all kind are developing. The police station is ccrowded. It becomes hard for our cops to cope with the stealing of evegetables in a garden and the shop lifting of a beautiful whore and the assault of an old lady by two teenagers.

Everybody goes out on Saturday nights. Teenagers are hbored and get drunk, girls get dressed, boys escape from their homes. And sometimes things go wrong. A girl is assaulted, beaten up, for nothing. Teenagers get drunk to 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 flew has emptied the police station. There is a small riot in the suburbs at the Cit_ des Muguets. Fighting ends up in throwing rubbish bins. The police has hard times waking up a drunk asleep in his car while his daughter is crying on the back seat. The drunk pretends that his ex girl friend drugged him. A drug deal in the Cit_ is based on a love story and the police officer sees her ex lover come back although she would have much prefered to forget him.

Things quickly go wrong. An arrested boy tries to commit suicide in the police station. His father gets very angry but the family is so bizarre that Kreusky and her team decide to dig deeper. The drug deal in the Cit_ has brought the narcotics at the Police station. This cohabitation is hard to cope with for everybody except for the pretty lieutenant who has a crush for a narcotic lieutenant.

It's Christmas Eve. The Christmas tree is in the cafeteria, everything's fine. Except that an ordinary man decides to burglar a small jewellery. He takes the saleswoman as a hostage. A school teacher fails at taking care of her own son and she accuses her sister to lock her 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 Cit_, he is about to commit suicide. How could he get away with it when he has no way to go?