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Britain's Greatest Private Detective (Paperback)

The Rise and Fall of Henry Slater

P&S History > British History > Victorian History P&S History > Humanities > Biography & Memoirs P&S History > True Crime

By Dr Nell Darby
Imprint: Pen & Sword True Crime
Pages: 224
Illustrations: 32 mono illustrations
ISBN: 9781399039574
Published: 30th January 2025

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From his offices at Basinghall Street in the City of London, Henry Slater presided over Britain's best-known private detective agency, king of all he surveyed. In the late Victorian era, and into the twentieth century, his name was synonymous with the Golden Age of private detection; he was a truly modern operator, utilising the press and technology, and creating innovative publicity campaigns to keep his agency in the public eye.

One of the key skills of the private detective was the ability to make friends - to infiltrate the lives of individuals, and to get them to trust them with their secrets. Slater, however, would make one mistake: to befriend the wrong person and to entrust them with his secrets. When that friendship ended, competition in the private detective world would lead to a trial so infamous that Winston Churchill himself came to watch proceedings play out at the Old Bailey. The trial would destroy Henry Slater's career, and expose his real identity.

This is the first in-depth study of private detective work in nineteenth and early twentieth century Britain, looking at the 'Golden Age' of private detectives and the work they did. It provides a fascinating look at the type of person who became a private detective, the people who wanted to be their clients - and the crimes that could be committed along the way. This book sheds new light on this profession, building on the author's previous work on female private detectives in order to enable the reader to gain a better understanding of a job that people of all classes desired to do. But it is also about the career of one man. Sherlock Holmes may have been the most famous fictional private detective, but Henry Slater was, for twenty years, the real star of the private detective world.

Rating: 5 out of 5 stars

This was a really well done book about Henry Slater, I really didn't know anything about it and thought this had fantastic information going through this. Dr Nell Darby wrote this in a way that worked with the reader and brought Henry Slater to life.

NetGalley, Kathryn McLeer

Rating: 5 out of 5 stars

A fascinating non-fiction book that reads like a novel.
Things are always changing and evolving in response to market forces, in the modern day it is AI that is influencing the job market. In the 19th century, a change to the laws governing divorce created a new need…for private detectives. The new laws meant warring partners could legally separate… so long as they had evidence of infidelity. Cue the rise of the private detective.
One man who spotted a niche in the market and jumped at the opportunity was Henry Slater (…if indeed that was his name, but you need to read the book to find out.) Slater established a private detective agency with a 100% success rate at achieving divorce settlements. He had an eye for marketing and (as his tale unravels) a man who was a stranger to truth.
This book is fascinating on so many levels, indeed, I read it with the panache usually lavished on a page-turning novel, such were the strands of intrigue. This is a story of greed, invention, human frailty, and a court case attended by a young Winston Churchill (because it caught his interest, not because he was involved.) It is a cautionary tale of arrogance, where a belief in ‘fixing things’ comes unstuck and the self-named “Greatest detective in Britain” is the author of his own downfall.

NetGalley, Pippa Elliott

Rating: 5 out of 5 stars

This book is hands-down a great book that I couldn't put down. Dr Nell Darby has created a wonderful masterpiece that I look forward to sharing with my own audience on my blog. I enjoyed the suspense and mystery that was written keeping me on my toes at all times. This book really puts detective work into a new light as he describes the life Henry Slater. If you are a fan of mystery and historical fiction, then this book is for you.

NetGalley, Mandy Kendrick

Rating: 5 out of 5 stars

As a child, I devoured Sherlock Holmes stories. I loved the idea of a private detective and Britain’s Greatest Private Detective adds real substance to that unknown and lost world. It’s an incredible book, supported by extensive and meticulous research with supporting bibliography. At the end of the book, there are research notes for each chapter, with additional information and these alone make interesting reading. A selection of photos of places and buildings relevant to the text are fascinating. The structure of the narrative with notes at the end means the flow of the main text isn’t interrupted.

This is a real slice of social history, crossing from the Victorian and into the Edwardian era. It’s not only the story of Henry Slater, arguably Britain’s most successful private detective, it’s a story of the courts and judicial system. It reads like an adventure. How had one man built a large and successful business ended up on the other side of the law? Dr Nell Darby gives a unique and detailed insight into not only the world of private investigation, but into attitudes and society at that time. Women had their place and it was very much a male dominated world. Slater was a first class publicist and knew how to capitalise on success to build a reputation. But his fall from Grace is equally exciting and I’ve enjoyed every page of this cracking title. Creates a real sense of time, place and people.

NetGalley, Anita Wallas

Well written and well researched book about the rise of private detectives in Victorian Britain - in particular, that of Henry Slater, the owner of the most well-known agency. His empire came tumbling down over a divorce case, where some of his team behaved appallingly and faked evidence. But nothing was quite as it seemed, including Henry Slater himself: a man who changed his identity several times on his quest to climb the social ranks, and it was very hard for the courts to pin down exactly who he was and where he'd come from. Henry was very good at covering his tracks, and the author had trouble finding out what really happened to him afterwards.

The book is a fascinating glimpse into the class system and how people could manipulate it. You can see why the nation was gripped by the court case: the salacious details, the way everyone tried to hoodwink everyone else, and who was actually guilty of what.

Fans of true crime will enjoy this one.

NetGalley, Pamela Brooks

Rating: 5 out of 5 stars

I read straight through this book in one day. Although non- fiction it reads like the best of novels. The tale of Henry Slater was a fascinating one . His life was laid bare due to a divorce case he and his company were working on and the fallout was catastrophic for his business and reputation. Fueled by gossip and the press it really mirrors todays exposes.

NetGalley, Karen Hammond

Rating: 5 out of 5 stars

This is a fascinating book, well-written and thoroughly researched. It is about a real private detective, yet at times it reads like a novel. In addition to telling the story of Henry Slater, this book discusses identity in Victorian society including class and gender. Even the parts of the book that feel slower are interesting in painting a portrait of Slater and the society in which he lived. I was totally engrossed, even while I was appalled by some of the actions that were pertinent to the trial. Fans of historical true crime (that doesn't involve murder) and Sherlock Holmes will likely find this book interesting.

NetGalley, Katie A

About Dr Nell Darby

Dr Nell Darby is a historian and writer whose PhD is in the history of crime, but who originally trained as a newspaper journalist. As the descendant of Victorian performers and journalists, she has long been interested in the lives of nineteenth-century actors, and how these lives were reported in the newspapers. Nell writes the popular Criminal Historian blog; this is her third book.

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