Following the mysterious disappearance of her friend, Louise, filled with grief, is internalised in a psychiatric ward.

In the greatest of secret, she gives birth to a baby boy that she names Mon Ange and who is endowed with an incredible singularity: he is invisible. Louise demands that Mon Ange never give himself away to the world that is too merciless faced with difference.

However, one day, Mon Ange meets Madeleine, a little blind girl who he falls madly in love with. And since she's blind, Mon Ange can love Madeleine all while keeping his secret.