The Blue Angel (Der Blaue Engel)

Professor Rath is an upstanding citizen, but when he discovers that some of his students have been frequenting a nightclub, he goes there himself to see what attracts them. There he meets singer Lola Lola, who captivates him so much that he returns the next night. As he falls in love with her, her influence over him grows, and soon he will do anything she asks.