German filmmaker G.W. Pabst and Hollywood expatriate
Louise Brooks re-team after the success of
Pandora's Box for the silent film Diary of a Lost Girl. On the day of her confirmation, innocent young Thymiane Henning (Brooks) is given a lockable diary as a present. She's distraught because the housekeeper Elisabeth (
Sibylle Schmitz) is leaving under curious circumstances and turns up presumably dead. Her duties are taken over by the conniving Meta (
Franziska Kinz), who accepts the advances of Thymiane's pharmacist father (Josef Ravensky). Trying to understand Elisabeth's fate, Thymiane agrees to meet her father's assistant, Meinert (
Fritz Rasp). She passes out, he carries her up to her room, and by the next scene she has borne a child by him. Meta snoops in Thymiane's diary and finds out it was Meinert's baby, so she suggests they get married. Thymiane refuses, so they throw her in a creepy reformatory for fallen women and leave her baby with a midwife. While in the reformatory, she meets Erika (Edith Meinhard), with whom she eventually escapes. To escape from poverty and homelessness, the girls then become nominal prostitutes in a brothel and are "sexually liberated." ~ Andrea LeVasseur, All Movie Guide