The biography of the criminal known as the "King of the Lags" a late 19th century London thief and murderer, musician and lover of animals, a ferocious killer who preached pacifism, and one of the greatest criminals in history. Respected by day as the pillar of middle-class piety, by night he plundered the homes of the wealthy. Originally published in 1911.

"The history of famous detectives, imaginary and otherwise, has frequently been written, but the history of a famous criminal-never. "This is a bold statement, but a true one all the same. The most notorious of rascals know that sooner or later they will be found out, and therefore they plan their lives accordingly. But they are always found out in the end. And yet there must be many colossal rascals who have lived and died apparently in the odour of sanctity. Such a character would be quite new to fiction, and herein I propose to attempt the history of the Sherlock Holmes of malefactors.

On 2 August 1876, a young policeman named Constable Nicholas Cock was shot dead while walking 'the beat' at Whalley Range, Manchester. A few months later, on the evening of 29 November 1876, Arthur Dyson, an engineer, was murdered in his own backyard at Banner Cross, Sheffield. Charles Peace was Victorian Britain's most infamous cat burglar and murderer. He was a complex character: ruthless, devious, dangerous, charming, intelligent and creative. Mrs Katherine Dyson identified him as the murderer of her husband, and as the police searched the country for him, Peace was living a life of luxury under another identity in London. One of these murders became the most notorious and scandalous case of the Victorian age, with a tale of illicit romance and a nationwide hunt for Britain's most wanted man; the other was to become a landmark in British legal history. Although no one suspected a link between them, these two sensational murder cases would, in the end, turn out to be tied together in a way that shocked Victorian society to its core.