whodunnit
noun [ C ] informal (US whodunit) uk/ˌhuːˈdʌn.ɪt/ us/ˌhuːˈdʌn.ɪt/
犯罪小说;侦探小说
a story about a crime and the attempt to discover who committed it
It's one of those whodunnits where you don't find out who the murderer is till the very end. 这是那种直到最后才能找出杀人凶手的侦探小说。
Synonym: mystery