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" The post-war turmoil experienced in Britain after the Armistice was succeeded by the misery of an economic slump, and then by the growing threat posed from overseas by Nazism and Fascism. It is no coincidence that the Twenties and the Thirties became the ‘Golden Age of Murder’, when novelists such as Agatha Christie, Dorothy L. Sayers and Anthony Berkeley crafted complex and original puzzles of whodunit, howdunit, and whydunit that tested readers’ wits and earned their authors fame and fortune. There was something unashamedly escapist about much detective fiction written during the Golden Age, but it is also true to say that the better books reveal far more about the society of the time than critics have acknowledged. That escapism regularly took engaging but wildly unlikely forms, with impossible crimes taking place within locked rooms, vital clues being hidden by way of complex cryptograms, and mysterious ‘dying messages’ uttered by murder victims who could never bring themselves to take the more obvious step of simply naming their killers. "
― Martin Edwards , Resorting to Murder: Holiday Mysteries
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" The notion of finding “a body in the library” of a country house was another trope of the genre. Christie had fun with it in The Body in the Library, where the corpse is found in Gossington Hall, owned by Miss Marple’s cronies, Colonel Arthur Bantry and his wife Dolly. But profound changes were taking place in British society as war was followed by peace-time austerity, and high taxes made it impossible for many families to cling on to old houses that were cripplingly expensive to run. Country house parties fell out of fashion, and although traditional whodunits continued to be written and enjoyed, detective novelists could not altogether ignore the reality. The scale of upheaval is apparent in another Marple story, The Mirror Crack’d from Side to Side, published twenty years after The Body in the Library. Gossington Hall has been sold off, and been run as a guest house, divided into flats, bought by a government body, and finally snapped up for use as a rich woman’s playground by a much-married film star. Her entourage provides a “closed circle” of suspects suited to the Sixties. "
― Martin Edwards , Murder at the Manor: Country House Mysteries
