It is cocaine...a seven-per-cent solution. Would you care to try it?

Arthur Conan Doyle

The Sign of Four

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Authentication Score 3

Original Citation

Doyle, Arthur. "The Sign of the Four; or, The Problem of the Sholtos." Lippincott's Monthly Magazine. London: Lippincott's, 1890, ch. 1.

Current Citation

Doyle, Arthur. The Sign of Four. The Sherlock Holmes Collector's Library. Detective Fiction, 2009, ch. 1.