Sherlock Holmes, fictional character created by the Scottish writer Arthur Conan Doyle. The prototype for the modern mastermind detective, Holmes first appeared in Conan Doyle’s A Study in Scarlet, published in Beeton’s Christmas Annual of 1887. As the world’s first and only “consulting detective,” he pursued criminals throughout Victorian and Edwardian London, the south of England, and continental Europe.

The Sign of the Four is the second of Arthur Conan Doyle's Sherlock Holmes novels. In it the detective and his companion Dr Watson unravel a mystery of hidden treasure and murder.

Miss Mary Morstan arrives at 221B, Baker Street to request help with the mystery of her missing father, her anonymous gifts of pearls and a letter requesting her to meet an unknown person that evening. Holmes takes on her case and the adventure begins.

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