The Sign of the Four first appeared simultaneously in the English and American editions of Lippincott’s Magazine for February 1890. Spencer Blacket published the first English book edition in the same year; P. F. Collier published the first American book edition in 1891. Calling at 221B Baker Street for help is Mary Morstan, a fetching young lady by whom Watson is totally charmed; ultimately, he marries her. She is the daughter of a captain in the Indian Army who mysteriously disappeared ten years earlier and has never been heard from again. Four years after the disappearance, Miss Morstan
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