A seraph offers contract killer Toby O'Dare a chance to save rather than destroy lives. Carried back through the ages to thirteenth-century England, to dark realms where accusations of ritual murder have been made against Jews, where children suddenly die or disappear, O'Dare begins his perilous quest for salvation.

In fifteenth century Rome, Toby O'Dare, a recently retired government assassin, receives a visit from the angel Malchiah. The heavenly figure instructs O'Dare to solve a grisly murder. But during the investigation, O'Dare discovers that the city is being haunted by an ancient demon and that solving the murder may have disastrous consequences for all of Rome.