L. Sprague De Camp is famous for his numerous light fantasy novels. They are sort of the potato chips of fantasy lit, tasty but not particularly filling. This is one of his lesser works. It is told from the viewpoint of a "fiend" summoned to an Conan-esque world. The gimmick is that fiends aren't evil demons, but beings from a metal-poor alternate reality who are leased into temporary service in exchange for iron. This particular fiend is a philosopher in his own reality. The mild humor of the book revolves around his misunderstanding of the human culture and his literal-minded misinterpretations of simple commands.I didn't actively dislike the book, but it isn't really worth the time to read it.