Agatha Christie up to the last chapter, then decided who the most unlikely suspect was, after which she would go back and make the necessary changes to "frame" that person. However, John Curran's "Agatha Christie: The Secret Notebooks" describes different working methods for every book in Christie's bibliography, contradicting the claim by Aldiss. Christie's mature novels, from 1940 onwards, often have titles drawn from literature. Four are from Shakespeare: Three are from the Bible: Another six are from other works of literature: In such cases, the original context of the title is usually printed as an epigraph. Similarly, the title of Christie's
Agatha Christie around 1959 she had transferred her 278-acre home, Greenway Estate, to her daughter Rosalind. In 1968, when Christie was almost 80 years old, she sold a 51% stake in Agatha Christie Limited (and therefore the works it owned) to Booker Books (better known as Booker Author's Division), a subsidiary of the food and transport conglomerate Booker-McConnell (now Booker Group), the founder of the Booker Prize for literature, which later increased its stake to 64%. Agatha Christie Limited remains the owner of the worldwide rights for over 80 of Christie's novels and short stories, 19 plays, and nearly 40 TV films.