I‘ll give Prosper‘s Demon a pick, but it‘s an odd one about an exorcist looking to prevent a demon from implementing a vague evil plan. Our narrator is completely unreliable and, as he himself warns, not particularly likable. Just what exactly are these demons? Are they even real? I found this book on Book Riot‘s list of best books under 200 pages. https://bookriot.com/best-books-under-200-pages