Under the German occupation, in a small French town, the arrival of a new priest arouses the interest of all women ... Barny, a young communist and atheist woman, can not however be more indifferent. Driven by curiosity, the young skeptic went to the church in order to challenge this abbot: Léon Morin. Usually so sure of it, Barny is yet to be destabilized by this young priest, as seductive as it is intelligent. Intrigued, it takes the play of their exchanges, to the point of questioning its deepest certainties. Would Barny not succumb to the charm of the young priest?