Book excerpt: Relating Sherlock Holmes's part in real-life crimes of the day, Donald Thomas brings the Great Detective to life once again in six narratives that display Holmes at his most determined, inventive and downright devious. What were Holmes's views on Dr Crippen? And what happened when Oscar Wilde visited Baker Street to seek advice? How did Holmes uncover a loving husband as one of the most dangerous psychopaths of modern times? And just what horrors await Holmes in the darkened slums of Waterloo Road? 'Thomas's imitation is wryly and subtly done' Guardian