Every guess I made during the course of the book was wrong! The surprise conclusion was great, particularly because I was not satisfied with any of my "guesses"; they were all unsatisfying and depressing. But the actual conclusion was definitely satisfying, and it dispelled all suspicions of cliché. The characters were well developed and likable, which is part of why my guesses were depressing. Well, the doctor wasn't exactly likable, but that's another situation altogether… Looking forward to the next one in the series.