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The Patriotic Murders (1940) (original 1940; edition 1940)
One, Two, Buckle My Shoe by Agatha Christie (1940)
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Wikipedia in English (1)
Hercule Poirot doesn't believe the amiable old dentist shot himself. He has too many clues and a killer who is not satisified with one victim.
(summary from another edition)
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