Disgraced by a mistake she made as a nurse trainee, Bridey Kelly has come to Greenway House—the holiday home of Agatha Christie—looking for redemption by caring for children evacuated from the Blitz. When a body washes ashore, Bridey realizes this is not a victim of war, but of a more personal killing. As the locals look among themselves, Bridey and her coworker Gigi discover they each harbor dark secrets, and the young women must unravel the truth before their safe haven becomes a place of danger.