One of Holmes's well-known talents is "play-acting" How does he show that he is skillful at disguise?
Holmes is expert at tricking criminals into telling him what he wants to know. How does he trick the Count into admitting that he knows were the diamond is?
Holmes is sure that the Count has stolen the diamond. What evidence has he used in building his case?
Describe Holmes's plan for recovering the diamond. What part do the dummy and the gramophone play in this plan?
The Count claims that he has fooled better men than Holmes. How does he plan to get away with the diamond? How does Holmes prevent his escape?
Why does Holmes play a practical joke on Lord Cantlemere? How does Lord Cantlemere become convinced that Holmes is a "brain"?