Widowed at the age of twenty, Madame Boissière devoted herself entirely to her two sons, Robert and Claude, whom she loves with a possessive affection... This is how unconsciously jealous, she took Robert away from the woman he loved, Irene, and that she now sees to it that Claude, single, stays away from any female presence other than his... Claude, a talented musician, suffers from the tutelage of this abusive mother .... Having left for the mountains, he meets a lonely girl, Anita...