Twain's "Double-Barrelled Detective Story" (1901).

Mark Twain. Library of
Congress, Prints and
Photographs Div.

Included in the Morgan Library's online exhibition "Mark Twain: A Skeptic's Progress" are two handwritten pages of Twain's spoof "A Double-Barrelled Detective Story" (1901) with a unique view of The Great Detective at work.