Agatha Christie Novel

by Kate
(United States)

Photo Credit: Crowbot

Can anyone out there tell me in which Agatha Christie novel a character (possibly Miss Marple of Ariadne Oliver) says that it is possible to recognise the author of a crime novel by the particular plot device used? The example given is that a locked room murder would immediately suggest that the author is John Dickson Carr.

Thanks for any help.