The Sign of the Four (1890), also called The Sign of Four, is the second novel featuring Sherlock Holmes by British writer Sir Arthur Conan Doyle. Doyle wrote four novels and 56 short stories featuring the fictional detective.
One of the coversheets to the original serial publication of the novel in Lippincott’s Monthly Magazine.
The 1892 cloth-bound cover of The Sign of Four after it was compiled as a single book
Sherlock Holmes is a fictional detective created by British author Arthur Conan Doyle. Referring to himself as a "consulting detective" in his stories, Holmes is known for his proficiency with observation, deduction, forensic science and logical reasoning that borders on the fantastic, which he employs when investigating cases for a wide variety of clients, including Scotland Yard.
Sherlock Holmes in a 1904 illustration by Sidney Paget
The cover page of the 1887 edition of Beeton's Christmas Annual, which contains Holmes's first appearance (A Study in Scarlet)
Holmes (right) and Watson in a Sidney Paget illustration for "The Adventure of Silver Blaze"
Holmes and archenemy Moriarty struggle at the Reichenbach Falls; drawing by Sidney Paget