When was the first Jack the Ripper book published?

There are numerous books and publications that deal with the mystery of Jack the Ripper. Some are factual or, at least, claim to be, while others are fictional. Still others blend fact and fiction together. This creates confusion for a person who wants to seriously study Jack the Ripper and the Whitechapel murders. lthough first published in 1994, Philip Sugden's historical investigation of the gruesome Whitechapel murders still stands out as a fact-based classic on Saucy Jack. There is certainly no shortage of books and movies about Jack the Ripper, the mysterious 19th century serial killer of London prostitutes (1888 - 1891). What makes Sugden's book stand out from the crowd is the fact that he started from scratch.