The Sign of the Four

A stolen treasure. A secret pact. A trail of murder that only one man can solve.
The Sign of the Four (1890) is Sir Arthur Conan Doyle's thrilling second Sherlock Holmes novel, showcasing the detective's unmatched genius alongside Dr. Watson in a mystery of greed, love, and betrayal.
When Mary Morstan arrives at 221B Baker Street with a strange case-a missing father, mysterious pearls delivered each year, and an anonymous letter-Holmes and Watson are drawn into a web of deception that leads to a priceless treasure and a deadly pact known as The Sign of the Four. From the dark alleys of London to a dramatic chase along the River Thames, Holmes unravels the case with dazzling deductions while Watson finds his heart tested by love.
Packed with suspense, action, and atmosphere, this novel established Holmes not only as a brilliant detective but also as a cultural icon. With its sinister villains, exotic backstory, and unforgettable conclusion, The Sign of the Four remains one of the most gripping detective novels ever written.
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