Mauricio is a French man who comes to Barcelona. He flees from justice. In the city he takes refuge in a pension in the Chinatown (today known as El Raval). There he falls in love with Pilar, the owner's niece. Shortly after his arrival, a murder is committed in the neighborhood and Mauricio becomes the prime suspect because of his dark past. But Pilar firmly believes that he is innocent and tries to find out the truth, but circumstances conspire against him.