Belgium in the 1950s. Jeanine Deckers dreams of becoming a singer and of going to Africa as a missionary. Against her family's wishes, she joins a convent. However, the strict rules become too much for her. She rebels, especially when her guitar is taken from her and when she hears that she'll have to wait several years before being sent to Africa for missionary work. Despite being punished, she is eventually given back her guitar so she can entertain young people visiting the monastery. One day she is filmed by Belgian television while singing and playing music to a group of youngsters. This launches her career as a commercially successful artist, yet everything she earns is sent to the monastery and the head nuns keep her identity secret from the general public, while keeping her success secret from Deckers herself.