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