The Adventure of the Cheap Flat - classic short story written by English author Agatha Christie. The story was first published as a book in the collection Poirot Investigates, 1924.
Hastings is at a friend's house with several other people when the talk turns to flats and houses. Mrs Robinson tells the party how she and her husband have managed to obtain a flat in Knightsbridge for a very attractive price. Poirot is interested and decides to investigate. The porter at the flat tells them that the Robinsons have been there for six months, despite Mrs Robinson's telling Hastings they had only just obtained the lease. Poirot rents another flat in the building and, by use of the coal lift, manages to gain entry to the Robinsons' flat and fix the locks so he can enter at will. Inspector Japp tells Poirot that important American naval plans were stolen from that country by an Italian called Luigi Valdarno who managed to pass them to a suspected spy for Japan, Elsa Hardt, before being killed.
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