Instruct: Classify Amazon reviews into positive or negative sentiment
Query: I enjoyed this book very much.

I read this book way back in 1978 and it still scares me to think about it. It was one of the few paperbacks that has stuck in my mind since then (I'm surprised I remembered the name of the book, ususally titles come and go with the read). Perhaps my brain has matured enough to stand the fright I felt the first time around. I think its time for a re-read. I'm only giving this 4 stars since I do not recall much about the storyline, only the scare it gave me at the time of reading it.