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What happens when a man who lives to punish others steps into a world he cannot control?
In Heinrich Mann’s Professor Filth, Professor Raat rules his classroom through discipline and fear. His pupils answer with a cruel nickname: Unrat, meaning rubbish or filth. When he suspects that Lohmann and other boys lead a secret life beyond school, he sets out to catch them.
His search takes him through dark streets to the Blue Angel tavern, where Rosa Fröhlich sings. Practical and good natured, she treats the lonely teacher kindly. As his need for control gives way to obsession, Mann exposes a small town that rewards cruelty while fiercely guarding its respectable name.
What you’ll discover
- A classroom at war Meet a teacher who turns lessons into a daily struggle to catch and punish his pupils.
- Beyond the school gates Follow Raat into the tavern world that draws his pupils away from his authority.
- Kindness unsettles the tyrant Discover Rosa Fröhlich, whose practical warmth disrupts a life built on rules and punishment.
- Respectability under scrutiny See how a town condemns scandal while allowing a schoolmaster to misuse his power.
- Laughter with a sting Enjoy Mann’s cool irony as he neither excuses Raat nor simply dismisses him with hatred.
Who will love it
This is for readers who enjoy sharp satire, strange love stories, and portraits of obsession. It suits anyone curious about school life, small-town scandal, and the way people remake one another.
What’s inside
The key ideas, in the 15-minute summary
- Fear rules the classroom and its ruler
- A poem leads him toward Rosa
- The hunter enters an unfamiliar world
- Being needed draws him closer
- The courtroom exposes his broken authority
- Their home becomes a public temptation
- Wounded authority turns toward anarchy
- Comedy reveals the pain beneath it
- Respectability and ruin live close together
Who’s who
- Professor Raat, called UnratA rigid schoolmaster who wants to catch every pupil who mocks his name, then finds he cannot live without a cabaret singer.
- Rosa FröhlichA sharp, kind and ambitious singer at the Blue Angel who wants money, comfort and respect and finds them with an unlikely admirer.
- LohmannA pale, clever pupil who writes poems and hides his love for an older woman behind cool irony.
- Count von ErtzumA strong, simple nobleman's son who worships Rosa and wants to make her his wife.
- KieselackA poor, sly pupil with bitten nails who sneaks into the cabaret and betrays his friends when it suits him.
- Kiepert and GusteA fat acrobat and his wife who share Rosa's dressing room and try to push her toward a profitable match.
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Professor Filth
by Heinrich Mann · 1905
A tyrant of a schoolmaster follows a pupil's naughty poem into a harbor cabaret and cannot leave.
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“Because his name was Raat, the whole school twisted it into Unrat, the German word for filth, and called him Filth.”
In short
Why would a respected teacher of ancient Greek end up lacing a cabaret singer's corset, pouring champagne for his own pupils, and running the wildest house in town? Heinrich Mann asks that question in Professor Filth, a German novel first published in 1905, and he answers it with comedy that slowly turns dark.
Professor Filth at a glance
- Reading time
- About 4 h 20 min3 h 25 min fast, 5 h 10 min slow
- Length
- 61,800 words
- Library level
- Medium longer sentences, everyday words
- First published
- 1905by Heinrich Mann
Reading time at 238 words a minute (fast 300, slow 200). How long the classics take to read · Updated
From the 15-minute summary · Key idea 1
A teacher called Filth rules by fear
Professor Raat has taught in the same school for twenty-six years. His pupils have twisted his name into Unrat, meaning filth, and the whole town knows it. He treats every shouted insult as a crime that must be proved. He can prove nothing, so he memorizes faces and waits.
One foggy morning, a heavy country boy, Count von Ertzum, bellows the hated word from a window. Raat takes the stairs in five bounds and sends the boy to the dark cloakroom he calls the hole. Then he sets a trick essay topic and rejoices as the class falls apart. Lohmann, a pale pupil who writes poems, cannot stand it. He rises and says that it smells of filth, and Raat drags him out too.
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Details
- First published
- 1905
- Language
- English
- Level
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Cite this edition
Mann, Heinrich. Professor Filth. Library of Alexandria, 2026, libraryofalexandria.com/products/professor-filth.
Mann, H. (2026). Professor Filth. Library of Alexandria. https://libraryofalexandria.com/products/professor-filth (Original work published 1905)
Mann, Heinrich. Professor Filth. Library of Alexandria, 2026. https://libraryofalexandria.com/products/professor-filth.
@book{mann2026professor,
author = {Mann, Heinrich},
title = {Professor Filth},
publisher = {Library of Alexandria},
year = {2026},
url = {https://libraryofalexandria.com/products/professor-filth},
note = {First published 1905}
}
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What is Professor Filth about?
It follows a strict schoolmaster nicknamed Unrat, or Filth. While hunting a pupil who wrote a poem about a cabaret singer, he meets her, falls under her spell, and slowly loses his post, his savings, and his old sense of himself.
Why is he called Unrat or Filth?
His pupils turn his real name, Raat, into Unrat, the German word for filth. The nickname has followed him for twenty-six years, and the story shows how much a single word can hurt, rule, and finally belong to him.
Is Professor Filth the story behind the film The Blue Angel?
Yes. The novel, published in 1905, gave the film The Blue Angel its plot of a teacher and a cabaret singer. The book is wider and darker, with more about the town, the pupils, and the tyrant's mind.
The author
Heinrich Mann
1871–1950 · German novelist
Heinrich Mann was a German writer born in Lübeck in 1871. He wrote novels and essays, including Professor Unrat (1905) and Der Untertan (1918). He left Germany in 1933 and lived in France before moving to the United States in 1940. He died in Santa Monica, California, in 1950.
“Because his name was Raat, the whole school twisted it into Unrat, the German word for filth, and called him Filth.”
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