whodunit: a detective story or mystery story , m-w.com , wordnet.princeton.edu

whodunit    \hoo-DUN-it\   noun 
         : a detective story or mystery story  

Example sentence:
         Betty packed several romance novels and whodunits to read at the beach.

Did you know?
         In 1930, Donald Gordon, a book reviewer for _News of Books_, needed to come up with something to say about a rather unremarkable mystery novel called _Half-Mast Murder_. "A satisfactory whodunit," he wrote. The coinage played fast and loose with spelling and grammar, but "whodunit" caught on anyway. Other writers tried respelling it "who-done-it," and one even insisted on using "whodidit," but those sanitized versions lacked the punch of the original and have fallen by the wayside. "Whodunit" became so popular that by 1939 at least one language pundit had declared it "already heavily overworked" and predicted it would "soon be dumped into the taboo bin." History has proven that prophecy false, and "whodunit" is still going strong

Definitions from other sites.

mystery: a story about a crime (usually murder) presented as a novel or play or movie
wordnet.princeton.edu/perl/webwn

A whodunit or whodunnit (for "Who done it?" and sometimes referred to as a Golden Age Mystery novel) is a complex, plot-driven variety of the detective story in which the puzzle is paramount. ...
en.wikipedia.org/wiki/Whodunit

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