whodunit whodunit /huːˈdʌnɪt/

noun

1. () [Informal] A story about a crime (usually murder) presented as a novel, play or movie  ( mystery , whodunnit [British] , whodunit [Informal] , mystery story )
   a story about a crime (usually murder) presented as a novel, play or movie
     She curled up with a thrilling mystery story before bedtime.
   She curled up with a thrilling mystery story before bedtime.