Inverted detective story

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An inverted detective story, also known as a "howcatchem", is a murder mystery fiction structure in which the commission of the crime is shown or described at the beginning, usually including the identity of the perpetrator. The story then describes the detective's attempt to solve the mystery. There may also be subsidiary puzzles, such as why the crime was committed, that are cleared up along the way. This format is the polar opposite of the more typical "whodunit," where all of the details of the crime and the perpetrator are not revealed until the story's climax.

R. Austin Freeman claimed to have invented the inverted detective story in his 1912 collection of short stories The Singing Bone. One early and prominent example of this sub-genre is Malice Aforethought, written in 1931 by Anthony Berkeley Cox writing as Francis Iles. The term "howcatchem" was later coined by TV Guide in the 1970s after the television series Columbo popularized the format.

In the 1990s, some episodes of Diagnosis Murder were presented in the howcatchem format, usually when featuring a "big name" (or at least recognizable) guest star. Presently, the TV shows Monk and Law & Order: Criminal Intent are frequently structured as howcatchems, with the viewer typically witnessing the killer commit the crime, and then watching as the detectives attempt to solve it (and, in some cases, prove that it has even been committed). However, both series also use the whodunnit format at times.

The popular Japanese anime and manga series Death Note is essentially a howcatchem.