Sylvie is a 60-years-old tutor who runs drama workshops at the prison. As time goes by, she fell in love with one of the inmates, Michel and is about to marry him. Yet her son Abel freaks out and disapproves, knowing that her relationships with inmates will always cause problems. With the help of his best friend, Clémence, he will do whatever it takes to protect her. Yet, meeting his new step-father offers him some new perspectives.