Trappist monk Boris Androvski (Charles Boyer) feels enormous pressure at having to keep his vows as a monk, so he flees his monastery. Yet he is the only one who knows the secret recipe of the monastery's famous liqueur, a recipe passed down from one generation of monks to another. Meanwhile, heiress Domini Enfilden (Marlene Dietrich) is newly freed from her own prison of caring for her just-deceased father and also seeks the exotic open spaces of the North African desert to nurture her soul.