Elisabeth and her brother Paul live isolated from much of the world after Paul is injured in a snowball fight. As a coping mechanism, the two conjure up a hermetic dream of their own making. Their relationship, however, isn't exactly wholesome. Jealousy and a malevolent undercurrent intrude on their fantasy when Elisabeth invites the strange Agathe to stay with them -- and Paul is immediately attracted to her.
Barny, although a Marxist, is intrigued by the mysteries of religion. In confession, she teases a priest, Léon Morin, but he is a young and intelligent man and ready to discuss anything.
After a novice nun learns of the sudden death of her parents, she leaves the convent to manage the family business and look after her teenage sister. Both of them fall prey to a womanizing mechanic with psychopathic tendencies.
