Set during the Blitz in 1940s London. After writing twelve Poirot novels in six years, Agatha Christie should be a rich woman. Instead she's struggling to make ends meet. As the money runs out, Agatha concocts a plan to kill off her most famous creation and sell the manuscript to a superfan. When Agatha's would-be-buyer suffers a heart attack, it seems unfortunate but benign. When her manuscript is stolen, a wider conspiracy begins to take shape. As the bombs fall and she investigates, the danger of her situation becomes apparent; Agatha herself is the killer's next target.