For fifty years after Dr Watson's death, a packet of papers, written by the doctor himself, lay hidden in a locked box. The papers contained an extraordinary report of the case of Jack the Ripper and the horrible murders in the East End of London in 1888. The detective, of course, was the great Sherlock Holmes — but why was the report kept hidden for so long? This is the story that Sir Arthur Conan Doyle never wrote. It is a strange and frightening tale...