Sign of the Four (Version 5)

The Sign of the Four, published in 1890, is the second novel featuring Sherlock Holmes, created by Sir Arthur Conan Doyle. The story follows a young woman who seeks Holmes's help regarding a mysterious clue, 'The Sign of the Four,' leading them into a web of murder, burglary, and romance. This novel is notable for introducing the character of Mary Morstan and exploring themes of loyalty and justice, further establishing Holmes's reputation as a master detective.
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