Gradually, they discover that, in reality, the lieutenant had found that Mélodie was a spy, in the service of the Germans. So he came to see her and accuse her. But she hypnotized Cain, also present, so that he would kill Trécesson. During the investigation, a fight ensues in which the artists killed each other. Ultimately, Cain is exonerated and Trécesson survives.
