whodunit

[hoo-duhn-it]
noun Informal.
a narrative dealing with a murder or a series of murders and the detection of the criminal; detective story.

Origin:
1925–30; jocular formation from question Who done it?, for standard English Who did it?

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World English Dictionary
whodunnit or whodunit (huːˈdʌnɪt)
 
n
informal a novel, play, etc, concerned with a crime, usually murder
 
whodunit or whodunit
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

whodunit
"murder mystery," 1930, U.S. slang, originally a semi-facetious formation from who done it?
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Despite the magnitude of the die-off, it's a whodunit that has long vexed
  geologists.
Writers read to see not whodunit, but how the author did it.
After all, the solution to a whodunit is never easy when you can't even be
  certain what got done.
It's easy enough to guess half of the whodunit denouement.
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