The Sign of the Four (Sherlock Holmes, #2)

by Arthur Conan Doyle

With his long, white, nervous fingers he adjusted the delicate needle, and rolled back his left shirt-cuff. For some little time his eyes rested thoughtfully upon the sinewy forearm and wrist all dotted and scarred with innumerable puncture-marks.

Eliminate all other factors, and the one which remains must be the truth."

"You really are an automaton,—a calculating-machine!" I cried.

"How often have I said to you that when you have eliminated the impossible whatever remains, HOWEVER IMPROBABLE, must be the truth?

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