M. Monet, a talented musician, loves his young wife Louise dearly. But Louise has a lover, Maurice Dartois. When Monet finds out that Louise cheats on him he gets so furious that Louise, scared to death, leaves the marital home and finds refuge at Maurice's. The trouble is that Maurice, who wants Louise only for himself, kicks his crippled brother Léo and his young sister Jeanne, who lived with him, out of his place. A regretful decision which will entail dramatic consequences...