Michael Augustino is a Washington, DC private investigator. He and his partner Jack don't just handle run-of-the-mill divorce and missing persons cases though - they specialize in cases involving the supernatural. Augustino is hired by the Bookworm, a local occultist with a thing for magical tomes and grimoires, to locate a book that some say could be used to summon a powerful extradimensional being named Tiamat. It sounds like the kind of thing that Augustino handles every day. But he soon learns that he's in way over his head when the entire DC occult underground also comes after the book....