noun
a type of mystery story or novel in which the identity of the perpetrator is not revealed until the end
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The detective novel was a classic whodunit, filled with twists and turns.
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Let's watch a whodunit movie tonight, I love trying to figure out who the killer is.
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That whodunit book had me on the edge of my seat the whole time.
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Life can sometimes feel like a whodunit, with mysteries and surprises at every turn.