Getty Images Felicity Jones will play Agatha Christie in a new movie! The 42-year-old two-time Oscar nominee has been cast as the iconic mystery writer in a noir thriller called Eleven Missing Days. César winner Vincent Cassel, known for films like La Haine and Black Swan, will co-star. The movie is based on Agatha's actual mysterious disappearance, with Deadline describing the plot as follows: "In December 1926, at the height of her fame, Agatha Christie became front-page news when she vanished in bizarre circumstances from her home.