Mystery doyenne Agatha Christie created an 11-day mystery of her own when she disappeared in 1926. This captivating novel, a Reese's Book Club pick, reimagines those mysterious days by looping Archie Christie's mistress, Nan O'Dea, into the intrigue. Author Nina De Gramont speculates on O'Dea's motivations, including murder, to explore in what way the mistress may have been involved in Christie's disappearance.