John Curran’s novel Agatha Christie’s Secret Notebooks: Fifty Years of Mysteries in the Making, a look at how the authoress planned and developed her tales, will include two Poirot stories that were found by Curran in notebooks left in Christie’s holiday home in Devon. The stories, The Mystery of the Dog’s Ball and The Capture of Cerberus were reworked into the novel Dumb Witness and a short story collection respectively.

Curran’s Agatha Christie’s Secret Notebooks: Fifty Years of Mysteries in the Making will be published by HarperCollins this fall.