Instruct: Classify Amazon reviews into positive or negative sentiment
Query: "The Ghost"

"Wait Till Helen Comes" is a good book for 10 thourgh 14 year olds. It is a science fiction book that is easy to follow. It keeps your attention and makes you want to keep reading. It's suspensful and entertaining.In the book Helen is a ghost and she is looking for her parents. She haunts a young girl until she finds her parents. It is a typical science fiction book that takes you to a haunted house, a church, a graveyard and a pond.I enjoyed the book and would recommend it to my friends if they are looking for a mysterious book. I would give it four stars.