The Memoirs of Sherlock Holmes

Thieves purloin the manuscript of a biography of a man who recently died.

Sherlock Holmes is visited by a woman who is concerned about her husband's habit of smoking opium to heighten his writing ability.

Inspector Hopkins calls on Holmes to help solve the murder of young Willoughby Smith.

Signor Zamba is murdered by a member of the Red Circle.

Sherlock Holmes is in the Highlands; Mycroft is called to recover the Mazarin stone.

Sherlock Holmes investigates the disappearance of Mary Cushing's sister.