Bridey Kelly has come to Greenway House-the beloved holiday home of Agatha Christie-in disgrace. A terrible mistake at St. Prisca's Hospital in London has led to her dismissal as a nurse trainee, and her only chance for redemption is a position in the countryside caring for children evacuated to safety from the Blitz. When a body washes ashore near the estate, Bridey is horrified to realize this is not a victim of war, but of a brutal killing. As the local villagers look among themselves, Bridey and fellow nurse, Gigi, discover they each harbor dangerous secrets about what has led them to Greenway. With a mystery writer's home as their unsettling backdrop, the young women must unravel the truth before their safe haven becomes a place of death.