Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Long, but well worth the effort!

I very rarely would give a book 5 stars, but I think this one deserves them. In a world full of trash, this book is extremely well written. Each character was well developed and seemed real. I found myself wondering if this wasn't a true story. It took me almost three weeks to finish, and I usually devour books quickly. It was even excruciating at times because it was so long, but stick it out and you won't be disappointed. It's a thriller that reads like a classic. Don't miss it!