Assumpta Mary-Margaret O'Conner's demon mark makes her fair game for any passing demon-and an attractive bargaining chip in the political alliances of Hell. Both courted-and stalked-by demons, she realizes she'll never have peace until she rids herself of the demon's mark. With the aid of her pendulum and the help of Brona Daly-resident ghost of Baltimore's Enoch Pratt Library- Assumpta discovers the one sure-fire way to get rid of the mark: make a deal with the demon who marked her. While Assumpta prepares for battle, Jak-the spirit she rescued from a demonic urn-rejoins her, bringing aid in the form of five Roman legionnaires and Saint Michael, the Archangel. Even with ghostly, and Heavenly help, can Assumpta preserver her life-and her soul-when she goes to Hell to challenge the demon who marked her?