Paris 1899. Corporal Jean Albertini, an orphan with humble origins, is chosen to infiltrate a band of anarchists. For him, this is a chance to advance in rank. But forced to compromise, no return, Jean begins to feel increasingly divided between the two cases. On the one hand, provide evidence incriminating evidence reports to his superior, Gaspar. On the other hand, he feels sincere begins to develop feelings for the anarchists band.