Prim professor Immanuel Rath finds some of his students ogling racy photos of cabaret performer Lola Lola and visits a local club, The Blue Angel, in an attempt to catch them there. Seeing Lola perform, the teacher is filled with lust, eventually resigning his position at the school to marry the young woman. However, his marriage to a coquette -- whose job is to entice men -- proves to be more difficult than Rath imagined.
Two barge skippers fall in love with the same woman.
Ellinor Patton is so wealthy that her six unsuccessful marriages are considered befitting of her status. She is currently unhappily single again and hoping for her lucky number seven. Vico, the hotel owner's son, dreams of a career as a singer and is in love with the flower girl Blanche. His father is eagerly trying to prevent both. Vico proves that he really has talent at a concert by the Mantovani orchestra.
