Prim educator Immanuel Rath (Emil Jannings) finds some of his students ogling racy photos of cabaret performer Lola Lola (Marlene Dietrich) and visits a local club, The Blue Angel, in an attempt to catch them there. Seeing Lola perform, the teacher is driven mad with lust, eventually resigning his position at the school to marry his beloved. However, married life with a woman whose job is to make men desire her proves more difficult than Rath imagined.