When Agatha Christie died in 1976, aged 85, she had become the world`s most popular author. Publishing at least one book every year since the 1920s, each one a bestseller, it was even claimed that Agatha must have a photographic memory. Was this true? Or did she resort to more mundane methods of planning her ingenious crimes? Unearthed among Agatha Christie`s affairs at the family home of Greenway were her private notebooks, 73 volumes in Agatha`s almost unreadable handwriting. When archivist John Curran began deciphering the notebooks, the extent of this treasure trove became This book lifts the lid on Agatha Christie`s biggest secret -how her pencilled notes, lists and drafts led to her many successful books, plays and stories. Different plots, alternative endings, deleted scenes - John Curran`s investigation reveals a wealth of unpublished material, including two complete Hercule Poirot short stories never before published, "The Incident of the Dog`s Ball"...