A collection of facsimiles of Dr. Watson's private papers, including notes, telegrams, maps, photographs, newspaper clippings, and other clues to assist the reader in solving the mystery of the Sign of four.

First published in 1890, The Sign of Four is Sir Arthur Conan Doyle's second book starring legendary detective Sherlock Holmes. The story is complex, involving a secret between four ex-cons from India and a hidden treasure. More complex than the first Holmes novel, The Sign of Four also introduces the detective's drug habit and leaves breadcrumbs for the reader that lead toward the final resolution.

Sign of the Four is one of the outstanding novels of the Sherlock Holmes series. It is a brilliant mixture of suspense and action with the protagonist disentangling an apparently unsolvable mystery and catching the criminal with great panache....

The Sign of the Four (1890), also called The Sign of Four, is the second novel featuring Sherlock Holmes written by Sir Arthur Conan Doyle. Doyle wrote four novels and 56 short stories featuring the fictional detective.

The Sign of the Four hides a secret pact among four convicts and two corrupt prison guards. According to Mary Morstan, her father requested her to meet him at the Langham Hotel in London upon his safe return from India. When Mary arrived at the hotel, she was told her father had gone out the previous night and not returned. Despite all efforts, no trace has ever been found of him. The second puzzle is that she has received six pearls in the mail from an anonymous benefactor, one per year since 1882. With the last pearl she received a letter remarking that she has been wronged and asking for a meeting. Holmes takes the case and soon discovers that Major Sholto, a friend of Mary's father, had died in 1882 and that within a short span of time Mary began to receive the pearls, implying a connection. The only clue Mary can give Holmes is a map of a fortress found in her father's desk with four names.

The Sign of the Four (1890), also called The Sign of Four, is the second novel featuring Sherlock Holmes written by Sir Arthur Conan Doyle. Doyle wrote four novels and 56 short stories featuring the fictional detective.