Lucy Worsley investigates Agatha Christie's shocking disappearance in 1926, her subsequent discovery and memory loss, and reveals the profound influence this experience had on her writing. On the evening of 3 December 1926, Agatha Christie left her home in Sunningdale, Berkshire, in her Morris Cowley. The next morning, her car was found abandoned, balanced precariously on the edge of a quarry. Agatha's coat, suitcase and driver's license were inside, but the author had disappeared. What followed was the biggest manhunt in Britain and front-page newspaper coverage. Was this a publicity stunt? A hoax? Or was Agatha the victim of foul play? Ten days later Agatha was discovered in a hotel in Harrogate, claiming to have lost her memory.