In real life, mystery writer Agatha Christie disappeared for 11 days in December 1926. To this day, no one knows the details of what she did during that time. The film gives a fictional account of Christie's time away, showing her as a woman fleeing her own life after the death of her mother and the announcement from her husband that he is leaving her. She flees to a spa in Harrogate. With the whole country looking for her, an American reporter finds her and ultimately tries to help her.