The Sign of the Four

Interesting Facts

• The book is the second novel about Sherlock Holmes, following «A Study in Scarlet».
• In this work, Dr. Watson appears as the narrator for the first time, which becomes a tradition for most Holmes stories.
• The book features one of Holmes' most famous mysteries, involving the Agra treasure.
• The novel explores the theme of colonialism and its consequences, which was relevant to Victorian England.
• The work introduces Mary Morstan, who becomes Dr. Watson's fiancée.
• The book contains one of the most famous chase scenes on the Thames, which was innovative for its time.
• In the novel, Holmes demonstrates his cocaine dependency, highlighting his complex character.