The Mystery of the Yellow Room · Character

Frédéric Larsan

A celebrated Sûreté detective with an artist's vanity and a sceptic's hardened eye, he finds himself outpaced by a teenage reporter.

major

Also known as Monsieur Frédéric Larsan, Larsan

First appearance: iii a man has passed like a shadow through the blinds

As a major figure in The Mystery of the Yellow Room, Frédéric Larsan is not background color—the story leans on what they do once the chapter opens.

Observed conducting his own investigation at the gate; reveals the arrest of the concierges and expresses skepticism about their involvement.

In the storyIn Which Joseph Rouletabille Makes a Remark to Monsieur Robert Darzac Which Produces Its Little EffectOpen this moment free

Larsan is everything the official investigation has: reputation, experience, and the quiet authority of a man who has seen too much to be surprised. He is elegant, self-assured, and slightly condescending — the kind of detective who pockets a key and studies a rival with 'searching and disquieting' eyes. His rivalry with Rouletabille is not hostile so much as hierarchical: the established professional versus the upstart journalist, and the tension of the novel lies in watching which method — experience or pure reason — will crack the Yellow Room first.

See Frédéric Larsan in In Which Joseph Rouletabille Makes a Remark to Monsieur Robert Darzac Which Produces Its Little Effect Book page

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Character Web

15 connections

A slice of how Frédéric Larsan sits in the book — open the reader for the full interactive map.

Relationship types

Rivalry
Psychological
Other

Character groups

Primary suspects and victims
Protagonist

+10 more in the full Character Web

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Narrative arc

Story tension across the book — this chapter sits in Exposition.

Setup
Escalation
Breaking point
Aftermath
Closing

This is the story's dramatic climax because it marks the emotional and psychological peak where Rouletabille’s…

Full beat labels and climax notes unlock in the reader.

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Relationships

Joseph Rouletabille
rivalry · negative
Larsan and Rouletabille are fierce intellectual adversaries, each trying to outwit the… How this plays out →
Mademoiselle Stangerson
psychological · negative
Daddy Jacques
rivalry · negative
The Green Man
psychological · negative
Joseph Rouletabille
rivalry · negative
Larsan and Rouletabille are fierce intellectual adversaries, each trying to outwit the… How this plays out →
Joseph Rouletabille
rivalry · negative
Larsan and Rouletabille are fierce intellectual adversaries, each trying to outwit the… How this plays out →
Mademoiselle Stangerson
psychological · negative
Daddy Jacques
rivalry · negative
The Green Man
psychological · negative
Mademoiselle Stangerson
psychological · negative
Daddy Jacques
rivalry · negative

Joseph Rouletabille
Larsan and Rouletabille are fierce intellectual adversaries, each trying to outwit the other in solving the mystery.
Mademoiselle Stangerson
Larsan is obsessively fixated on Mademoiselle Stangerson, viewing her as both a target and a key to the crime.
Daddy Jacques
Daddy Jacques distrusts Larsan and often works against his methods, creating a tense opposition.
The Green Man
Larsan and the Green Man share a hidden, manipulative connection that drives the central conflict.
Joseph Rouletabille
Larsan and Rouletabille are fierce intellectual adversaries, each trying to outwit the other in solving the mystery.
Joseph Rouletabille
Larsan and Rouletabille are fierce intellectual adversaries, each trying to outwit the other in solving the mystery.
Mademoiselle Stangerson
Larsan is obsessively fixated on Mademoiselle Stangerson, viewing her as both a target and a key to the crime.
Daddy Jacques
Daddy Jacques distrusts Larsan and often works against his methods, creating a tense opposition.
The Green Man
Larsan and the Green Man share a hidden, manipulative connection that drives the central conflict.
Mademoiselle Stangerson
Larsan is obsessively fixated on Mademoiselle Stangerson, viewing her as both a target and a key to the crime.
Daddy Jacques
Daddy Jacques distrusts Larsan and often works against his methods, creating a tense opposition.

Relationship notes

How these ties play out is in the reading companion — open the free preview.

See Frédéric Larsan in iii a man has passed like a shadow through the blinds

In the story

Frédéric Larsan appears across 23 companion beats. Open any chapter in the free preview to see the notes beside the text.

In Which Joseph Rouletabille Makes a Remark to Monsieur Robert Darzac Which Produces Its Little Effect
Observed conducting his own investigation at the gate; reveals the arrest of the concierges and expresses skepticism about their involvement.
In the Heart of the Oak Grove
Mentioned as the policeman circling the lake; Rouletabille expresses confidence in his abilities.
In Which Rouletabille Sets Out on an Expedition Under the Bed
Mentioned as being by the lake, not examining the Yellow Room, and claiming he will explain the murderer's escape in a natural way.
IX: Reporter and Detective
Silently observes the footprints by the lake; Rouletabille warns him against reasoning from preconceived ideas.
We Shall Have to Eat Red Meat—Now
Mentioned as the Chief of the Sûreté arriving at the park gate; Rouletabille anticipates his involvement.
In Which Frédéric Larsan Explains How the Murderer Was Able to Get Out of The Yellow Room
Chief of the Sûreté, present during the examination; his earlier explanation of the murderer's escape is referenced.
XII: Frédéric Larsan’s Cane
Found already watching the scene from the tree; his new cane is the focus of Rouletabille's suspicion, and he reveals he found it after the crime.
XIII: “The Presbytery Has Lost Nothing of Its Charm, nor the Garden Its Brightness”
Actively working against Darzac, holding the cane as evidence and developing a theory that the murderer entered the Yellow Room later in the evening.
I Expect the Assassin This Evening
Mentioned as having gone to Paris to pursue Darzac; Rouletabille criticizes his reasoning abilities.
XV: The Trap
Awakened by Rouletabille; posted at the window to prevent escape.
Strange Phenomenon of the Dissociation of Matter
Joins the chase from the 'off-turning' gallery and claims to have touched the murderer.
The Inexplicable Gallery
Discusses the case with Rouletabille, notes the footprints and the murderer's disappearance, and suspects Robert Darzac.
XVIII: Rouletabille Has Drawn a Circle Between the Two Bumps on His Forehead
Rouletabille contrasts his own method with Larsan's, calling him a fool and accusing him of relying on 'merely animal intelligence.'
XIX: Rouletabille Invites Me to Breakfast at the Donjon Inn
Mentioned as someone Rouletabille alternately admires and disdains, and as a person to whom Darzac's suspicions may be mentioned.
An Act of Mademoiselle Stangerson
Mentioned as having provided background information about Arthur Rance's history with the Stangersons.
On the Watch
Dines with Rouletabille and Sainclair, engages in cryptic conversation about the case, then suddenly collapses, apparently drugged.
XXII: The Incredible Body
Opens his window and calls out; shares disappointment at the outcome.
XXIII: The Double Scent
Joins Rouletabille in tracking footprints and questioning Daddy Jacques; expresses uncertainty about an accomplice.
Rouletabille Knows the Two Halves of the Murderer
Drives the conveyance for Darzac's arrest; shows a joyful expression at the capture.
XXVI: In Which Joseph Rouletabille Is Awaited with Impatience
Called to give his theory on the keeper's death; explains the murderer likely killed the keeper while escaping, but is interrupted by Rouletabille.
XXVII: In Which Joseph Rouletabille Appears in All His Glory
Present in court, accepts Rouletabille's challenge, and is ultimately revealed as the murderer through Rouletabille's reasoning.
XXVIII: In Which It Is Proved That One Does Not Always Think of Everything
Has vanished after being exposed; his lie about the cane and his wound are discussed.
XXIX: The Mystery of Mademoiselle Stangerson
Identified as the notorious Ballmeyer (Jean Roussel), who blackmails and attacks Mademoiselle Stangerson, and frames Darzac.

Chapter companion notes

Spoil-light check-ins for Frédéric Larsan unlock in the free preview.

See Frédéric Larsan in iii a man has passed like a shadow through the blinds

See Frédéric Larsan in In Which Joseph Rouletabille Makes a Remark to Monsieur Robert Darzac Which Produces Its Little Effect