Hannah, the author of six mystery novels, is adding a new book to the Poirot canon: The Monogram Murders. The book will be set in 1920s London, around the time of The Murder of Roger Ackroyd.

But as any Christie devotee will tell you, Agatha Christie, who died at age 85 in 1976, is always having a moment. Her books have sold more than 2 billion copies worldwide.

When you buy through links on our articles, Future and its syndication partners may earn a commission. Credit: Getty Images The BBC has revealed that it's adapting Agatha Christie's 1967 haunted ...

One other book that was helpful was Jared Cade’s “Agatha Christie and the Eleven Missing Days” – the first 90 pages detail the search and the headlines and the rest of the book is his ...