Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Looking for a book to help you sleep? This is it!

It's amazing that this fourth book in the series can be more boring than the third book. It's almost as amazing that I could force myself to read the whole book -- I guess the first two books instilled some serious loyalty in me. My review for the third book holds for this book too, only it's worse than that:This whole book seems like filler that Jean M. Auel inflicted on us just because she decided this series should have six books in it before she started the series. The book is overflowing with boring sex scenes -- if I wanted this much sex in a book, I think I know where to look for something like that, but it wouldn't ever be anything by Jean M. Auel.