The Stretton Street Affair

In Short

First published in 1922, this classic mystery opens when a young engineer is coerced into certifying a suspicious death in a Mayfair mansion. Unconscious hours later, he wakes to find the corpse gone, the home vacant, and his own memory clouded by a rare oriental toxin. His quest for answers takes him from London to Florence, Madrid, and Amsterdam. Packed with secret identities, dangerous chemistry, and high-stakes financial crime, this globe-trotting tale endures as a vivid snapshot of post-World War I European intrigue.

The Story

On a foggy winter night in London, electrical engineer Garfield is lured inside a luxurious residence in Stretton Street. The home belongs to Oswald De Gex, a fabulously wealthy, internationally renowned financier. De Gex shows Garfield the body of a beautiful young woman, claiming she is his niece, Gabrielle Engledue, who has suddenly died of heart failure. Pressed by the millionaire, Garfield signs a formal certificate of death. Shortly afterward, De Gex offers him a drink infused with a subtle, aromatic poison called orosin. The drug muddles Garfield’s brain, rendering his senses rigid while leaving his mind barely intact. He manages to drag himself to an open window for air, but loses consciousness and is later found dumped in France near St. Malo.

Upon his recovery and return to England, Garfield visits Stretton Street, only to find the mansion empty under a caretaker's watch. De Gex denies ever meeting him, insisting he was in Italy at the time. Determined to uncover the truth, Garfield joins forces with his friend Harry Hambledon, a rising lawyer. They trace De Gex to his magnificent Tuscan estate outside Florence. There, Garfield discovers a network of co-conspirators, including a sinister Italian physician named Dr. Tito Moroni—the creator of orosin—and an elusive French banker, Gaston Suzor.

As Garfield pursues the mystery across Europe, he encounters a young woman named Gabrielle Tennison, who is the exact double of the girl whose death he certified. She is suffering from partial amnesia caused by a dose of the same terrible drug. Falling deeply in love with her, Garfield vows to bring her attackers to justice and seek a cure from a specialized French professor. His investigations reveal a string of strange deaths targeting wealthy figures across the Continent, including a Spanish aristocrat and a Dutch philanthropist named Baron van Veltrup. The murders are executed using razor fragments dipped in orosin and concealed inside victims' gloves.

With the aid of a Spanish detective named Señor Rivero and local authorities, Garfield pieces together De Gex’s true plot. The industrialist, backed by a Spanish bandit named Despujol and his associate Mateo Sanz, has been systematically murdering associates to seize their fortunes and cover up fraudulent enterprises. Driven into a corner by Scotland Yard and European police, De Gex is finally trapped in London. Rather than face trial, the disgraced financier commits suicide using his own poisoned blade. With his demise, the conspiracy collapses: Moroni is imprisoned, Sanz is executed, and Garfield, now happily married to a fully recovered Gabrielle, retires to a quiet life in the Surrey countryside.

How It Unfolds

The fatal certificate Garfield enters the Stretton Street house, where he is tricked into signing a death certificate for a young woman before being drugged with a strange, perfume-scented poison.

An empty mansion Waking up in France, Garfield recovers and returns to London, only to find Stretton Street deserted and De Gex completely denying the encounter.

Pursuit in Tuscany Determined to prove his sanity, Garfield travels to Florence to confront De Gex, discovering the involvement of the sinister Dr. Moroni and a terrified young wife, Mrs. Cullerton.

The double appears Back in London, Garfield meets Gabrielle Tennison, a girl suffering from severe memory loss who bears an uncanny resemblance to the victim at Stretton Street.

Clues in Madrid Garfield tracks the conspirators to Spain, narrowly surviving an attempt on his life involving poisoned carpet pins planted near his bed.

Murder in Amsterdam The investigation moves to Holland, where a Dutch financier is assassinated by an orosin-laced steel blade hidden inside his glove.

Unmasking and justice Cornered by the police, De Gex kills himself in his cell using his own poison, paving the way for his accomplices' capture and Garfield's peaceful marriage to Gabrielle.

The People

• Garfield: A hardworking electrical engineer who stumbles into a deadly plot. He wants to clear his name, solve the Stretton Street mystery, and protect the woman he loves. He grows from an unwitting bystander into a persistent investigator.
• Oswald De Gex: A world-famous, multi-lingual financier whose vast wealth conceals a ruthless criminal network. He seeks to execute murders using chemical poisons to secure his financial empire. He ends his life by his own hand when exposed.
• Gabrielle Tennison: A young woman targeted by De Gex's inner circle. Administered the amnesia-inducing drug orosin, she struggles to regain her identity and sanity, ultimately recovering to build a quiet life with Garfield.
• Harry Hambledon: Garfield's loyal friend and an ambitious young barrister. He wants to help Garfield untangle the conspiracy and provides crucial legwork across Europe.
• Dr. Tito Moroni: A Tuscan doctor who distills the deadly drug orosin for De Gex. He operates under the guise of respectability until his ultimate arrest and fifteen-year prison sentence.

In Its Own Voice

"Suddenly a sweet perfume greeted my nostrils... It seemed as though some pastille were burning somewhere, for soon it became almost sickening, an odour utterly overbearing."

Garfield experiences the subtle onset of the mind-altering poison while trapped in the Stretton Street mansion.

"To me the motive of poor Gabrielle Engledue's death was now quite apparent, and, moreover, it seemed that the reason De Gex required a forged death certificate was because he was not exactly certain whether by a post-mortem examination any trace of the drug could be found."

Garfield pieces together why the international financier needed his professional signature on that fateful night.

"Rather than face a trial and the penalty for his crimes, he had killed himself by that same most deadly drug by which he had sought to enrich himself."

The tragic end of the mighty European millionaire inside his Bow Street police cell.

What It's Really About

Beneath its swift, globetrotting mystery structure, the narrative probes the terrifying vulnerabilities of post-war European high society. It questions how easily immense wealth and respectable titles can mask organized criminal networks. De Gex represents an elite class of shadow manipulators whose power spans international borders, influencing banking systems, cabinet ministers, and regional law enforcement alike.

The novel also wrestles with the terrifying frailty of human memory and perception. Through the toxic effects of orosin, the plot explores how gaslighting, drug-induced amnesia, and false identities can leave an innocent person doubting their own sanity. Justice in the story depends not merely on official institutions, but on individual persistence against powerful figures who operate entirely above the law.

Why Read It Today

Readers who enjoy early twentieth-century detective fiction, classic mystery tropes, and continent-crossing thrillers will find much to admire here. The novel offers a captivating glimpse into post-World War I Europe, capturing the grand hotels of Florence, the train routes of France, and the foggy streets of Mayfair. It moves along at a relentless pace, relying on sudden reveals, exotic chemical weapons, and shadowy international villains.

Modern readers should be prepared for the melodramatic tone and period conventions typical of early 1920s popular pulp fiction. The dialogue can feel theatrical, and the plot relies heavily on fortunate coincidences and sudden travel logistics. Additionally, the depiction of foreign characters reflects early twentieth-century British perspectives and stereotypes. However, for those looking for an entertaining, atmospheric mystery with an inventive poison plot and classic European backdrops, this narrative delivers an enjoyable escape.