<p><span>S¿as Duffy''s fourth novel, "Sherlock Holmes and the Sixty Steps" follows a similar format to his previously published Holmes collections: a novella together with some shorter stories. The four stories are: "The Tragedy of Langhorne Wyke" (1890); "The Mystery of the Thirteen Bells" (1895); "The Adventure of the Sixty Steps" (1897); "The Problem of the Coptic Patriarchs" (1898).</span></p><p><span> </span></p><p><span>"The Tragedy of Langhorne Wyke" sees the detective and his chronicler travel to Yorkshire''s North Riding to solve the double murder of a well-heeled but mysterious couple. Holmes and Watson are immediately confronted with the sudden, and ominous, disappearance of the two witnesses to the murder - an elderly widow and her travelling companion. The trail eventually leads ba