The story in one page
Mademoiselle Stangerson survives a violent assault inside her bedroom at the Glandier château. The door was locked, the shutters bolted, and the windows sealed, leaving no exit for the assailant. Police are baffled, but a precocious teenage reporter named Joseph Rouletabille arrives to apply his unique brand of logic. While detectives chase obvious leads, Rouletabille navigates hidden passages and familial secrets to identify the attacker. He deduces the existence of a notorious criminal mastermind operating under a false identity, ultimately forcing a confrontation that reveals the truth behind the impossible room and the shadows haunting the Stangerson household.
Who's who
- Joseph Rouletabille
A teenage reporter who solves puzzles using pure logic.
- Mademoiselle Stangerson
The victim whose secret history drives the entire plot.
- Robert Darzac
The primary suspect who remains devoted to the victim.
- Frédéric Larsan
A police detective whose theories rival Rouletabille's investigation.
- Ballmeyer
A master criminal hiding in plain sight as a detective.
What it's really about
- Logic
- Reasoning is the only tool for impossible crimes.
- Identity
- Criminals often hide behind prestigious professional roles.
Why it's memorable
- A red handprint left on a yellow wall.
- A mysterious phrase about a presbytery and a garden.
The ending, explained
Spoilers — show the ending
Rouletabille exposes the criminal mastermind and solves the mystery, though he is left brooding over personal secrets. He remains haunted by the memory of a lady in black, suggesting his own origins are as mysterious as the case he just closed.
For your book club
- How does a locked door become a psychological trap?
- Can a teenager outsmart professional police with simple math?