whodunit
US /ˌhuːˈdʌn.ɪt/
UK /ˌhuːˈdʌn.ɪt/

1.
romance policial, mistério de assassinato
a story or play about a murder in which the identity of the murderer is not revealed until the end
:
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She loves reading classic whodunits by Agatha Christie.
Ela adora ler romances policiais clássicos de Agatha Christie.
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The movie was a gripping whodunit with many twists.
O filme era um romance policial emocionante com muitas reviravoltas.