This book does what is sets out to do - gives the reader an entree into the world of the early private detectives, the people drawn to this type of work, the methods used, and the cases they were typically involved in. Anchoring this tome is the character of Henry Slater - the self proclaimed "greatest detective" of his time.

Darby notes that it was with the passing of the Matrimonial Causes Act 1857 that gave rise to the private detective as courts required evidence of matrimonial misdeeds in order to grant a divorce. This was primarily the type of work available for the private detective, especially one with no connection to the police department.

It is against this that Darby focuses on the case that brought down Slater and his agency - the Pollard divorce case - and highlighted the underhanded dealings that went on to secure the evidence (ie: honey trap, payment of witnesses). None of this would have come to light had Slater not spurned the friendship of one of his employees - Francis Stevens - ".. a man who would do anything to get revenge ..." - including setting up a rival agency and using others to bring about Slater's downfall.

The proceeding court case against Slater and his employees is followed in detail, always referring back to the original Pollard divorce case and methodology used in gaining the required evidence.

Darby follows through to not only the conclusion of the case against Slater et al, but also what followed afterwards for the main players in this drama. Did they get off or were all incarcerated? What happened to the Pollards?

At times the construction of the narrative was a little annoying as it tended to go back and forward in the timeline, but overall it was quite easy to follow. The research that went into this tome is very evident, a times a little dry but never uninteresting.

Definitely one for those interested in the detective agencies that were the UK equivalent of Pinkertons in the 19th and 20th centuries.

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.

Thank you to NetGalley and Pen & Sword for the free eARC! I post this review with my honest opinions.

This review is cross-posted on Goodreads, and will be posted on Amazon and Instagram upon the book's publication.