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Triple Threat is an omnibus edition published by Dodd, Mead and Company in 1943 comprising three books of short stories: Poirot Investigates, The Mysterious Mr. Quin and Partners in Crime. The book carried the subtitle "Exploits of Three Famous Detectives: Hercule Poirot, Harley Quin and Tuppence" (note no Tommy).

A second edition of the omnibus was published by World Publishing Company (Cleveland) in 1 Jan 1944. This has the title "Agatha Christie's Crime Reader" and does not have the subtitle.

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