Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Good at first,horrible at last

This is about a boy named Billy who goes to Camp Nightmoon.He thinks it's pretty good.But then one night Billy's friend Jay comes back saying a monster named Sabre got Roger.After that,every time someone goes on a hike or event,someone disappers.Then Billy thinks hes got to get out of Camp Nightmoon.Very BAD and Cheesy ending.You've wasting your time if you read this book.The Tv Episode is much better than the book.I strongly reccomend you see the episode.I'm dissapointed with R.L. Stine on this book.If you like Goosebumps, you should read these books,Calling All Creeps,Beware The Snowman,It Came From Beneath The Sink or Goosebumps Series 2000 book Earth Geeks Must Go!