In Chicago in 1931, Asta Eicher, mother of three, is lonely and despairing, pressed for money after the sudden death of her husband. She begins to receive seductive letters from a chivalrous, elegant man named Harry Powers, who promises to cherish and protect her, ultimately to marry her and to care for her children. Weeks later, all four Eichers are dead. Emily Thornhill, one of the few women journalists in the Chicago press, becomes deeply invested in understanding what happened to this beautiful family, particularly to the youngest child, Annabel, an enchanting girl with a precocious imagination and sense of magic.