whodunnit


Concise Oxford English Dictionary © 2008 Oxford University Press:
whodunnit /huːˈdʌnɪt/ (US whodunit)
noun informal a story or play about a murder in which the identity of the murderer is not revealed until the end.
– origin 1930s: from who done it?, non-standard form of who did it?
'whodunnit' also found in these Oxford entries:

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