It has been thirteen years since the Fourth Crusade captured Constantinople. Father Michael has spent those years exterminating the supernatural creatures that once infested the city. Shortly after returning home to Provence, he stumbles upon a nest of vampires, creatures his order believed they had driven from Europe. Alone and cut off from his brother hunters, he turns to Enik, an aging knight tormented by guilt over his actions in the Crusade.
For them both to survive, Michael must initiate Enik into spiritually dangerous supernatural secrets that his order has guarded for centuries. He will also learn that the penitent knight and a centuries-old vampire know secrets that his own order kept hidden from him.