In Chicago in 1931, Asta Eicher, a widow with three children, is lonely and pressed for money after the sudden death of her husband. She begins to receive seductive letters from a elegant man named Harry Powers, who promises to marry and care for her and her children. Asta agrees to go with him to West Virginia to see his house there, and then to bring her children. Weeks later, all are dead. Emily Thornhill, a journalist, covers the case and becomes deeply invested in understanding what happened to this beautiful family, and determined to make sure that Powers is convicted.