Which event in the story is a key detail in Holmes’s solution of the case?
Athe observation that Mr. Wilson belonged to the Freemasons
Bthe walk around Saxe-Coburg Square
Cthe invitation to the police agent from Scotland Yard
Dthe violin concert at St. James’ Hall
Athe observation that Mr. Wilson belonged to the Freemasons
Bthe walk around Saxe-Coburg Square
Cthe invitation to the police agent from Scotland Yard
Dthe violin concert at St. James’ Hall