Stories / The Case-Book of Sherlock Holmes · 1924
The Adventure of the Illustrious Client
A collector of women keeps a locked book of his conquests; vitriol settles what evidence could not, and Holmes burgles for the book that breaks the spell.
✅ Public domain — read, share, and adapt freely.
⚠️ Spoilers below. The analysis discusses the solution, including who did it and how it's found out.
Summary & analysis
An unnamed illustrious client engages Holmes through intermediaries to stop the marriage of a besotted young woman to Baron Gruner — a charming collector of ruined women who keeps a locked diary of his conquests.
Persuasion fails against Gruner's spell, so Holmes works two fronts: a Chinese-pottery disguise to gain the baron's study, and a ruined former victim, Kitty Winter, who can testify to the lust-diary. Violence intrudes — Holmes is beaten in the street — but the plan advances.
While Holmes distracts Gruner over fake porcelain, Kitty flings vitriol across the baron's face and the diary is seized; its pages break the young woman's infatuation where argument could not. Justice arrives disfiguring and extra-legal, and Holmes does not much regret it.
Deeper reading
A collector of ruined women
The Illustrious Client pits Holmes against Baron Gruner, a suave predator who keeps a book cataloguing his conquests, and the case escalates to vitriol and burglary. Doyle gives the late canon one of its most genuinely menacing villains, and the story\'s outrage at the seduction and destruction of women gives it real moral heat.
Justice by other hands
Holmes engineers the theft of the incriminating book but the decisive blow — the acid that ends Gruner\'s power — comes from a wronged woman, not the detective. As in Milverton, the canon lets a victim deliver the justice the law cannot, and Holmes is content to have arranged the conditions rather than struck the blow.
Techniques on display
Interrogation & deception
Testing stories for the thread that doesn't reach the wall.
In this story: The case turns on testimony that can't be cross-examined into silence: Kitty Winter's lived evidence and the diary's own pages do what deduction cannot — break an obsession.
Argument & fallacy
Untangling claims, premises, and the flaws between them.
In this story: Holmes argues that a man the law cannot reach may still be stopped by exposing his own record — moral reasoning that licenses the theft of the diary.
Practise what this story preaches: every technique above links to a tool or game built on the same method. The best way to learn the canon is to reason along with it.