A young couple, Renée and Pierre, take one night a room at the Hôtel du Nord, in Paris, near the canal Saint-Martin. They want to die together, but having shot at Renée, Pierre lacked the courage to finish the job and fled. Another customer, Monsieur Edmond, a procurer, rescues her. When Renée goes out of the hospital, she is hired as a waitress at the hotel. Monsieur Edmond falls in love with her, but Renée is still thinking of Pierre...