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This collection, published in 1917 at the height of the First World War, includes 8 stories written mainly in the 1910s. The author tells the story of the best German spy in England, von Bork, who is preparing to leave for his homeland with secret documents and is unaware that Sherlock Holmes is already on his trail ("His Farewell Bow"). "The Adventure of the Cardboard Poodle, The Case of the Crimson Circle, The Disappearance of Lady Frances Carfax - in all these cases, according to Dr Watson, the famous detective truly "surpasses himself."