Taryn Cornick believes that the past --- her sister's violent death and her own ill-conceived revenge --- is behind her, and she can get on with her life. She has written a successful book about the things that threaten libraries: insects, damp, light, fire, carelessness and uncaring…but not all of the attention it brings her is good. A policeman, Jacob Berger, questions her about a cold case. Then there are questions about a fire in the library at her grandparents' house and an ancient scroll box known as the Firestarter, as well as threatening phone calls and a mysterious illness. Finally, a shadowy young man named Shift appears, forcing Taryn and Jacob toward a reckoning felt in more than one world.