Kornel Makuszyński · a Polish mystery classic · 1937
A seventeen-year-old who reads people like open books. A Napoleonic treasure hidden 124 years ago. Violet eyes, a gang from the woods — and a manor near Vilnius where someone keeps stealing… a door.
Thirty seconds from chapter two: a boy is accused of theft, and at one in the morning Adam finds the proof nobody else noticed. That’s how the Devil from the Seventh Grade works.
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June 1937 · Warsaw
A June morning in a Warsaw gymnasium. Professor Gąsowski calls on student after student — none can answer. Adam stands up and confesses: he's cracked the professor's hidden method and built the class's secret schedule. The professor calls him a „devil" — and that's how the nickname is born.
Walk through the whole novel in illustrations — from a school desk in Warsaw to a flooded cellar near Vilnius. No spoilers for the ending. Click any picture to see it full size.
Chapter 1
Adam cracks Professor Gąsowski’s secret method — and on Saturday, to the whole class’s delight, pulls three unposted letters out of the professor’s pocket. “You devil!” groans the professor. The nickname sticks for good.
Chapter 2
A poor boy is accused of theft. At one in the morning, bent over the school co-op’s ledgers, Adam holds a single black thread up to the lamp — and saves someone’s good name.
Chapter 3
Wanda appears in the doorway. Violet eyes — and a story about a manor near Vilnius from which someone keeps trying to carry off… a door.
Chapter 4
Holidays at Bejgoła: bearded ancestors in the portraits, an evening in the park with Wanda. And at night — a shadow among the trees, Winnetou-style stalking and a blow Adam never saw coming.
Chapter 5
Wanda carries the unconscious detective through the night forest. Adam wakes with a bandaged head full of theories: what is really hidden in this house?
Chapter 6
Old papers wait in the attic. In Father Koszyczek’s diary the winter of 1813 comes alive: French soldiers, a sick colonel and a secret he took to his grave.
Chapter 7
A wandering painter in a wide-brimmed hat comes to the manor. He paints landscapes… and studies the portraits far too closely. Then the diary disappears.
Chapter 8
A lone expedition for a letter a century old. A cryptic note, “Dan. Al. Inf.”, leads straight to the Divine Comedy — and to one sentence that changes everything.
Chapter 9
At night, through the fog, Adam tracks the gang to a lonely house by a lake. Dogs wait by the kennel. And men who aren’t joking.
Chapter 10
A cellar, a storm and water rising by the hour. Beside Adam — a wounded Frenchman who finally tells where the letter came from.
Chapter 11
An escape by boat across a raging lake. The boat capsizes — and the hero turns out to be someone nobody suspected.
Chapter 12
Meanwhile at Bejgoła: a strange letter, a storm over the manor and a knock at the professor’s window in the night.
Chapter 13 · finale
124 years, three ciphers, one door. How the case of Colonel de Berier ends — and what those violet eyes will see — you’ll hear for yourself.
Case file · audiobook
A 1937 Polish detective classic, reborn. Boy detective Adam Cisowski unravels a 124-year-old riddle: Napoleonic diamonds hidden in a Vilnius manor, a pair of violet eyes, and a band you don't want to cross.
Voice: licensed AI narration (ElevenLabs), no cloning of real narrators — labelled in line with the EU AI Act. Play the sample and judge for yourself.
Dramatis personae
A boy detective, a girl with violet eyes, a Napoleon-loving history professor, a band from the woods — and diamonds from 1813.
Antagonist · false artist
A short, stocky drifter in a wide hat and a peacock scarf — a "wandering painter" whose hands betray him: gorilla-thick, brigand's hands. The muscle of the band — and the man who cracked Adam over the head in the dark.
Brigand's hands
Caretaker · gang's watchman
A hunched peasant keeping the lonely forest cottage the band uses as its lair — the man who helps imprison Adam, then creeps in by night with milk, bread and a blanket. A conscience caught between two sides.
ConscienceEvery case has its hour. The colonel's Napoleonic diamonds waited for the right boy through four generations.
The Grande Armée retreats from Moscow. Colonel Kamil de Berier, an engineering officer, carries a bundle that is meant to restore his family’s fortune.
The sick colonel reaches Bejgoła near Vilnius. At night he measures and draws something; dying, he cries: “Those doors!” His letter never reaches his brother Armand.
The Gąsowskis carry a wounded insurgent priest to safety on a door taken off its hinges. The priest keeps the door. Nobody knows what it hides.
In a Warsaw gymnasium, seventh-grader Adam Cisowski admits he has cracked Professor Gąsowski's hidden method — and earns the nickname that names the book.
Summer at the manor near Vilnius. The first violet eyes. The first stranger by the fence. The first blow to the head.
Dante, a flooded cellar, a box full of scrap iron and one last riddle: who never eats from a flat plate? The answer is in the audiobook.
Flip the cards and find the pairs. Fewer moves — the sooner you catch the culprit.
You cracked it in 0 moves!
Time: 0:00
Professor Gąsowski, the silver-haired historian with the wide, astonished eyes of a child, looked at his class the way one looks at foreigners — with polite patience and a quiet hope that someone, anyone, would say something sensible.
In the third row sat Adam Cisowski, short and stocky, awkward in the shoulders but with a gaze bold and oddly piercing. Around him thirty seventh-graders feigned an interest in the Russian campaign of 1812.
“Kaczanowski!” the Professor called.
Kaczanowski rose, opened his mouth, closed it, opened it again, and finally wriggled out with consummate diplomacy:
“Sir, today is Thursday, and Thursday isn’t my day.”
The Professor narrowed his eyes. Adam raised his hand. Thirty heads turned slowly — they all knew that when Cisowski stood up, something happened. Something that could not be taken back.
“Today is our Waterloo, sir. Napoleon failed to see the deep ditch on the battlefield, and I failed to foresee the Professor’s mistake. From that — our shameful defeat.”
The Professor stepped back and looked at Cisowski as one looks at a sorcerer. And Cisowski spoke on, calmly, with an ironic smile at the corner of his mouth:
“The Professor has a method. I discovered it long ago. I drafted the form’s rota. Today it was Kaczanowski’s turn. And Ostrowicki’s. And Wnuk’s. They all rose, and none of them knew, because today is Thursday — and on Thursday the boy who studies is the one going to the cinema on Friday.”
The class fell silent. You could hear the corridor clock ticking and the quiet creak of a bench — Staszek Burski held his breath so sharply that he nearly folded over.
Thirty pairs of eyes fixed on the Professor. The Professor fixed his eyes on Cisowski. A long moment passed — long enough for a history lesson to become something else entirely.
“You devil!” the Professor whispered. “You little Satan!”
That is how it began. Everything else — diamonds, letters, violet eyes — comes later.
Liked the excerpt? The whole case is waiting in the audiobook.
🎧 Buy & listenA set of Napoleonic diamonds hidden in 1813 by a dying colonel at a crumbling manor near Vilnius. A French letter, lost for 124 years, holds the only clue to where they are, and the clue points to a door. Adam has one summer — and a band of criminals who got there first.
A seventeen-year-old Warsaw gymnasium student nicknamed “the Devil of Class 7” after he reveals the professor’s secret examination method to the whole form. Sharp, loyal and quietly ironic, he unravels the Napoleonic mystery during a summer stay at the Bejgoła manor near Vilnius — until a pair of violet eyes complicates every calculation.
The Painter poses as a wandering landscape artist, but his gorilla-thick brigand’s hands give him away. He is the muscle of the criminal band hunting the hidden diamonds — and the man who attacks Adam in the dark when the boy gets too close to the truth.
Yes. The Devil from the Seventh Grade (original title: Szatan z siódmej klasy by Kornel Makuszyński) is available as a full English-language audiobook on the Audio Opowieści platform, with AI narration (licensed synthetic voice), an original interwar score and scene illustrations.
Ages 12 and up. The 1937 novel is a young-adult detective classic widely read across generations — enjoyed equally by adult fans of classic mystery fiction. The audiobook runs approximately 8 hours 32 minutes across 13 chapters.
The narration is performed by a licensed synthetic voice (AI, ElevenLabs) — no cloning of real narrators. We label it on every title, in line with the EU AI Act (art. 50). The text, illustrations and music are the work of people. Play the free 3-minute sample with the ▶ button on this page.
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First 5 minutes free. Full book in the store. Scene illustrations appear as the story unfolds.
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