''The Diary of Jack the Ripper'', which came to light in 1991, revealed the identity of the world's most notorious serial killer. At the time it was widely believed to have been a hoax, yet, incredibly, not one person has managed to prove how it was forged or by whom. This, argues Paul Feldman, is because the diary was genuine. Discover how the largest and most detailed investigation on the subject ever to be undertaken led the author through the smokescreen of an official cover-up, via the Royals and the Masons, to the true provenance of the Diary, Jack the Ripper's watch and, ultimately, his identity.