A slow, complex and involving tale of a French priest and his moral trials and tribulations, Under the Sun of Satan is adapted from the Georges Bernanos novel of the same name. Father Donissan (Gerard Depardieu) struggles to save the soul of the 16-year-old pregnant woman Mouchette (Sandrine Bonnaire) in this allegorical drama. She is the mistress of a married politician, but she carries the child of a poor nobleman. Mouchette shoots and kills the nobleman when he refuses to run away with her, and the emotionally tortured Donissan flagellates himself with a chain and despises his superior Menou-Serais (Maurice Pialot). This dramatic struggle of good versus evil took the Golden Palm Award for Best Film at the 1987 Cannes Festival. The selection was not without controversy, as the verbal protests of the audience led to an obscene gesture from the miffed director.
~ Dan Pavlides, All Movie Guide