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There's _Trent's Last Case_, an early deconstruction of the mystery, in which the detective's reasoning is ultimately revealed to be completely wrong.
There's another book in which, after everything was out, one character remarked the detective had unmasked the conspiracy, had the detective reply, "There was no conspiracy. And I uncovered it by accident."
A Father Brown story had a death by natural causes be disguised to look like a crime so that the detective would be distracted from a planned robbery.
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