who·dun·nit
noun/ˌhuːˈdʌnɪt/
/ˌhuːˈdʌnɪt/
(British English) (also whodunit North American English, British English)
(informal)- a story, play, etc. about a murder in which you do not know who did the murder until the end
（到结尾才知道凶手的）侦探小说，侦探戏剧，侦探作品 Word Origin1930s: from who done it?, non-standard form of who did it?