Raised in a convent, Avril (Sophie Quinton) is about to take her permanent vows when Sister Bernadette (Miou-Miou) reveals to her that she has a long-lost twin brother, David, who was left in an orphanage run by Jesuits, and encourages her to find him.
In her search for her brother, Avril slowly discovers the real world beyond the walls. She befriends a kind young man named Pierre as she hitches a ride down the coast to the seaside resort town of Camargue. There, they find Avril's brother and his boyfriend enjoying a holiday. Meeting David and spending time with him and the other two young men opens Avril’s eyes to new perspectives in life.