Definitions

1. noun

a play or novel with a mystery plot, typically involving a murder, whose identity of the perpetrator is unknown until the end, or a detective story whose identity of the perpetrator is unknown until the end.

“The new movie is a classic whodunit that keeps the audience guessing until the very end.”

2. noun

a mystery or puzzle to be solved

“The whodunit of the missing treasure has been a topic of discussion for months.”

3. interjection

used to express surprise or excitement at a puzzle or mystery

“Whodunit! Who could have committed such a heinous crime?”