Arthur Conan Doyle Based Sherlock Holmes on a Real-Life Scottish Surgeon Who Used Deduction to Diagnose Patients and Investigate Crimes

A new book chronicles the exploits of Joseph Bell, an Edinburgh lecturer whose lessons sparked the creation of the world’s most famous detective

Lindsey Fitzharris | Author, Sleuth-Hound: The Case of the Real Sherlock Holmes

October 16, 2026 9:00 a.m.

It was still dark on a winter morning in 1878 when a pair of chestnut horses, harnessed to an elegant carriage, began their journey through Edinburgh’s cobbled streets. A cold front had gripped the city like a steel gauntlet, tightening its hold with each passing hour. Perched high on the elevated driver’s seat was a coachman, who held his whip lightly in his hand as he guided the two animals—named Major and Minor—toward the city’s oldest hospital. Sheltering under the carriage’s folding roof was its only passenger, a lithe man with a face fringed by gray whiskers. His steel-blue eyes scanned his surroundings for anything out of the ordinary.

The carriage rattled through the narrow lanes of the Scottish capital’s Old Town, where the chimneys belched columns of coal smoke into the still air, and the ramshackle houses rose ten stories or higher. Now and then, a hunched figure emerged from a doorway and scurried across the street, vanishing into the next road. But for the most part, the city still slept.

At last, Major and Minor passed through the ornate gates forming the old hospital’s main entrance. The coachman gave the reins a gentle tug, and the horses drew to a slow halt. Joseph Bell—senior surgeon at the Royal Infirmary of Edinburgh—stepped down from the carriage and nodded his thanks to the driver. Pulling his coat tighter, he strode toward the hospital doors, eager to discover what new puzzles the day would bring.

The Royal Infirmary’s amphitheater consisted of a stage partially enclosed by a semicircle of tiered stands rising toward a large skylight, which illuminated the area below. In the center of the room was a wooden operating table, with a long, sawdust-filled tray positioned below it to catch blood and other fluids. On this occasion, though, much to the relief of some of the younger attendees, the table had not been dressed for a surgical demonstration.

The wooden stands groaned under the burden of medical students chatting as they awaited instruction in the chamber. As Bell entered, the hubbub died away. He removed his hat and coat, handed them to his dedicated young clerk, and walked to the center of the circular chamber. He then took his seat as a patient was ushered into the room. Bell pressed the tips of his slender fingers together as he studied the dress, mannerisms, features, expressions and traits of the man presented to him. The attendees fell silent, thrilled at the prospect of witnessing another spectacle, the likes of which had made Bell a celebrated figure in the medical world.

“Of course, gentlemen,” he said, breaking the silence that was stifling the room, “he has been a soldier in a Highland regiment.”

Bell then pointed out confidently that the man’s short stature meant he was probably a musician in a band, and that the swagger in his walk was suggestive of someone who played the bagpipes. Once the surgeon had finished sharing his assessment, he turned his attention back to the visitor, who—much to Bell’s surprise—shook his head in contradiction. In fact, the man said, he had never served in the armed forces. He was merely a shoemaker with no military background whatsoever.

“This was rather a floorer,” Bell would later recall, “but being absolutely certain I was right, and seeing that something was up, I did a pretty cool[-headed] thing.” He ordered two strong assistants to take hold of the patient and strip him to the waist. Sure enough, a lie was uncovered. Plain to see on the man’s chest was a telltale letter “D,” which had been tattooed into his skin using a spring-powered instrument studded with ink-loaded needles. The tattoo was well known to the whole audience—and shameful.

“Of course, the reason of his evasion was at once clear,” Bell remarked. The professor would be bested by no one—least of all an army deserter. No record survives of what happened to the patient next, nor did Bell think it worth recording. The deception, once exposed, was the end of the story.

In regular performances such as this one, Bell transformed the business of diagnosis into electrifying theater. His students were transfixed, and none more so than a thickset young man with a bushy mustache who was always seated at the front of the audience. Under the light of the amphitheater, Arthur Conan Doyle absorbed the details of every feat performed by the man who, in time, would inspire him to create Sherlock Holmes.

Since his first appearance in print in late 1887, and in the 59 tales of his adventures that Conan Doyle went on to write after that, Holmes has become, unassailably, the most iconic and beloved fictional detective of all time. So popular was he in the late 19th and early 20th centuries that many people believed him to be a real person. Holmes has been depicted in film and television more than 250 times, earning him the Guinness World Records title for the most-portrayed literary human character in history.

So vivid is the popular image of Holmes—clad in a deerstalker cap and tweed cape and brandishing a calabash pipe and a magnifying glass—that one doesn’t need to know the stories in order to recognize the character. Yet the history of the man whom Conan Doyle identified in newspaper interviews and letters as the inspiration for the great Holmes is far lesser known. In addition to his work as a surgeon, Bell assisted the Scottish police with multiple criminal investigations, making significant contributions to the burgeoning field of forensic science.

From the moment Conan Doyle began studying under Bell at the University of Edinburgh in 1878, he was struck by his professor’s superhuman diagnostic methods, immortalized in many anecdotes passed among students. When a young doctor determined that a patient with a limp was suffering from a disease of the hip joint, Bell immediately scoffed, “Hip—nothing!” He went on: “Were you to observe closely, you would see that there are slits, cut by a knife, in those parts of the shoes where the pressure of the shoe is greatest against the foot. The man is a sufferer from corns, gentlemen.”

But Bell instinctively knew that this patient had not come to the hospital to seek help for his feet. “This is a case of chronic alcoholism,” he explained. “The rubicund nose; the puffed, bloated face; the bloodshot eyes; the tremulous hands and twitching face muscles … all show this. These deductions, gentlemen, must, however, be confirmed by absolute and concrete evidence. In this instance, my diagnosis is confirmed by my seeing the neck of a whiskey bottle protruding from the patient’s right-hand coat pocket.”

For Bell, every patient was a text to be studied. Symptoms could divulge personal secrets, gestures could disclose clues, and the most minute detail could help him decipher a medical riddle. This way of thinking—treating medicine as a science of reading signs—captivated Conan Doyle. It showed him that diagnosis and detection demanded largely identical skills. Both required a sharp eye for hidden details and the ability to weave observations, inferences and deductions into a coherent story.

Among those who knew him, Bell was a legend. He would regale dinner guests with gripping tales. On trains, he would amuse his children with insights about where the other passengers in the carriage were from, where they were going, their occupations and their habits. “All this without having spoken to them,” his daughter recalled. “When he verified his observations, we thought him a magician.” Bell made a lasting impression on everyone he met. As historian Z.M. Hamilton, who attended college in Edinburgh, remarked, “Bell was much beloved by his students and was responsible for creating pretty nearly a whole generation of amateur detectives.”

Beyond his roles as doctor and educator, Bell began working in earnest in the early 1870s with his friend and colleague Henry Duncan Littlejohn, Edinburgh’s eminent police surgeon and a pioneer of fingerprinting and crime-scene photography. Like the fictional Holmes, Bell was critical of the “tunnel vision” of many police officers, and he brought his unique brand of logic to his criminal investigations. By 1892, when Conan Doyle revealed that Bell was the model for Holmes, Bell had been working with Littlejohn for more than 20 years to solve some of Britain’s highest-profile murder cases of the century.

The years that Conan Doyle spent under Bell’s tutelage provided the budding author with abundant fuel for his literary creations. “It is all very well to say that a man is clever, but the reader wants to see examples of it—such examples as Bell gave us every day in the wards,” Conan Doyle later wrote.

Bell’s influence on the Holmes canon was profound. “After Dr. Watson, no physician is more affectionately associated with Holmes than Dr. Joseph Bell, and all [too] little is known of his private life,” a former student once observed. Bell supplied the touchstone characteristic that set Conan Doyle’s creation apart from other fictional detectives of the era. By scrutinizing a scratch on a desk, a trace of cigar ash or the guttering of a tallow candle, Holmes—and Bell—could build a case from what seemed like trivialities. Their genius lay not in knowing everything, but in noticing what others overlooked and uncovering its meaning.

Without Bell, it’s unlikely that the Sherlock Holmes the world has come to know and love would even exist. But the fictional exploits of the Baker Street detective have eclipsed the life, work and humanity of the real-life sleuth-hound whose talents shaped the minds of generations of medical students, cracked a multitude of criminal cases, and diagnosed the mysterious illnesses plaguing both the young and the old in his care.

For all of his accomplishments, however, Bell himself is largely absent from histories of forensics and criminology. His contributions to these disciplines are not documented in textbooks nor commemorated on a plaque at Scotland Yard. Yet for those who know how to look, his fingerprints are everywhere. His conviction that the smallest material trace could point to a deeper truth did not remain confined to the lecture theater: When Jack the Ripper began stalking London’s Whitechapel district in 1888, Bell followed the killings from Edinburgh with professional fascination. He even claimed to have identified the murderer, although the identity of his proposed suspect remains unknown.

Bell’s forensic reputation was forged case by case, against the backdrop of a city gripped by sensational crime. There was the notorious poisoner Eugène Marie Chantrelle, whose story so unsettled his drinking companion, the Scottish author Robert Louis Stevenson, that it later inspired Strange Case of Dr. Jekyll and Mr. Hyde. There was the “baby farmer” Jessie King, whose trial for the murders of two infants in her care put Bell himself in the witness box. And there was the mysterious death of a young aristocrat on the Ardlamont country estate, a murder case so baffling that Bell’s expertise was drawn into a courtroom saga worthy of Holmes himself.

Time and again, Bell and Littlejohn helped build the template that Conan Doyle would later use to shape his fictional detective. The tools of Bell’s trade? A sharp eye and a disciplined mind, guided by an unshakable conviction that the body always gives up its secrets.

Excerpted from Sleuth-Hound: The Case of the Real Sherlock Holmes by Lindsey Fitzharris. Published by Farrar, Straus and Giroux. Copyright © 2026 by Lindsey Fitzharris. All rights reserved.

Caution: Users are warned that the work appearing herein is protected under copyright laws, and reproduction of the text, in any form, for distribution is strictly prohibited. The right to reproduce or transfer the work via any medium must be secured with the copyright owner.