As adults, best friends Julien and Sophie continue the odd game they started as children -- a fearless competition to outdo one another with daring and outrageous stunts. While they often act out to relieve one another's pain, their game might be a way to avoid the fact that they are truly meant for one another.
It's mid 19th century, north of France. The story of a coal miner's town. They are exploited by the mine's owner. One day the decide to go on strike, and then the authorities repress them.
A cabaret is used as a cover for drug trafficking, but the police are unable to uncover the means used to smuggle the opium. It turns out that one of the accomplices is repatriating the bodies of her compatriots who have died abroad and smuggling the drugs. A race is waged between the police and the culprits: the law triumphs.
Two women, Léa and Clotilde, with two men, Ludovic and Papillon, form a nice quartet of crooks. Their targets: pharmacists, diamond dealers, and gogos of all kinds who respond to enticing classified ads. Business is booming, but the police are watching. Commissioner Masson will eventually arrest them, but, ironically, for a matter of which they are totally innocent.