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 Paris flea market vendor is transformed into a vigilante after his fiancée is murdered by three vicious thugs on a commuter train. As the revenge-minded young man tracks the killers, a veteran police inspector leads a parallel investigation.