Asher Grey is Victorian London's only consulting exorcist. Beneath the surface of the physical world is the realm of the mystical and unnatural-the things that go bump in the night. Sorting these things out is Asher's calling. If only he could manage to get a paying client or two. When Asher is called to perform an exorcism on an asylum patient, he quickly realizes this is not a typical case; the thing possessing the patient threatens the...