Nicolas, 12-years-old, is perfectly fond of his mother, Lorraine, who adopted him at his birth. Piano, tennis, chess, he has a ministerial schedule, and he is a happy child, for whom everything goes well until the day when - he discovers that Marcello, his beloved piano teacher, is in love with his mother. And Marcello is not a man like any other. Marcello is blind. Sharing his mother with a man is already very difficult, impossible. But to share it with a disabled person, that seems to him humiliating, devaluing, and unacceptable. He decides to drive back this intruder by all means. And all means this can go very far.