I finally received my SantaThing books from LibraryThing, and The Fourth Man, by K.O. Dahl, was one of the books I got. I already own a copy, so if anyone wants this one, it's yours. Just be the first one to leave a comment to claim it and send me an email with your home address.
I haven't got to my copy yet (coming next month), so I don't know if it's any good, but hey, it's free!