The Casebook of Sherlock Holmes · Character

Count Sylvius

A polished foreign aristocrat with a taste for other people's treasures, whose charm and violence make him one of the most dangerous men Holmes has ever faced.

supporting

Also known as Count, The Count

First appearance: The Adventure of the Mazarin Stone

As a supporting figure in The Casebook of Sherlock Holmes, Count Sylvius is not background color—the story leans on what they do once the chapter opens.

The prime suspect in the theft of the Mazarin Stone; confronts Holmes and nearly attacks the wax dummy.

In the storyThe Adventure of the Mazarin StoneOpen this moment free

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The Count moves through London society with the ease of a man who has never been refused anything, collecting information and valuables with equal appetite. Sir James Damery warns Holmes plainly that this is a man to whom violence is familiar and who will stick at nothing — a description Holmes receives with a knowing smile. His pursuit of the Mazarin Stone sets up a battle of wits in which Holmes must match cunning against cunning, and the Count's composure under pressure makes him a worthy adversary rather than a mere thief.

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Character Web

14 connections

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

Relationship types

Rivalry
Other

Character groups

Mazarin Stone criminals
Protagonist
Shoscombe Old Place suspects
Holmes's inner circle

+9 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 excerpt marks the dramatic climax because it reveals the story’s central emotional and psychological peak…

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Relationships

Sherlock Holmes
rivalry · negative
Count Sylvius is a dangerous criminal adversary whom Holmes pursues and outwits. How this plays out →
Sherlock Holmes
rivalry · negative
Count Sylvius is a dangerous criminal adversary whom Holmes pursues and outwits. How this plays out →
Sherlock Holmes
rivalry · negative
Count Sylvius is a dangerous criminal adversary whom Holmes pursues and outwits. How this plays out →

Relationship notes

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

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In the story

Count Sylvius appears across 1 companion beat. Open any chapter in the free preview to see the notes beside the text.

The Adventure of the Mazarin Stone

Chapter companion notes

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