The long game
(Book)

The unnamed narrator of The Long Game is an Adept, a member of an Ecclesiastical order charged, among other things, with opposing a race of immaterial demons, creatures capable of possessing and controlling human minds. Complicating the narrator's life is the fact that, over time, he has developed a cordial "relationship" with one of the demons. Complicating matters further is the unexpected arrival of Amalasomtha, a young woman with impossible abilities who claims to have come from the remote--perhaps mythical--country of Idalia. She also claims that, for reasons she does not entirely understand, she has been tasked with capturing one such demon and returning with it to Idalia. The truth, it turns out, is considerably more complex. Amalasomtha's arrival sets in motion a chain of events encompassing murder, magic, deception, and an array of unintended consequences.--,From publisher's website.