Dr John Watson is too good a friend-and too fine an Englishman-to record everything of his adventures with consulting detective Sherlock Holmes. His stories in The Strand are exciting, uplifting, and moral, while the unvarnished truth was often far more complicated than that. Good men are not always angelic and London in the 1890s was a place of great promise as well as grim despair. In this unpublished account, "The Bull Dancer,"...