Set in wintry 1945 Warsaw and based on true incidents, Anne Fontaine's "The Innocents" is a moving study of what happens to the faithful when God's plan suddenly seems impossible to follow. In its early scenes, a young French Red Cross doctor named Mathilde (Lou de Laage) is summoned to a rural convent after a frantic nun, Sister Maria (Agata Buzek), pleads with her for help.