André Garnier, a young pianist, who was sent to deportation following a denunciation, absolutely wants to find his informer. He falls in love with Hélène, the mistress of a wealthy industrialist, Bernier, in whom he soon discovers the man who once sold him to the Gestapo. Bernier is soon found murdered. André deflects suspicion on Jacques, the victim's secretary. Hélène and André's affair ends up being discovered by the police, who seem to see in it the motive for the crime. André surrenders to justice.

The Dombreval troupe is the last vestige of an outdated form of entertainment: the traveling theatre. Mireille is the director, strong, courageous, but overwhelmed by the hardships and financial difficulties. Full of dignity, she refuses negotiations and compromises, confronting all with determination. The end is however near, Mireille is aware of it.