On December 3, 1926, the great mystery writer, Agatha Christie left for a weekend in Yorkshire. Her car was found abandoned nearby. The police couldn't locate her for ten days. Finally, she was found registered at a hotel under a fake name apparently suffering from severe amnesia. On this episode, Katie explains some of the theories behind her bizarre disappearance. Plus, recommendations for your summer reading, and the Doctor Who episode that best explains Christie's disappearance.