The start of this book I found very dull, it was just moany teenagers and I was so close to giving up because I thought 'if they are going to be like this the whole time, I'm out' but I pushed on a little further, and it was worth it. Once the bus crashes and falls into a canyon, things get dark and creepy really fast. The characters develop some proper personalities and the book becomes very addictive from this point forwards. There are a few flaws plot wise that I guess we're left up to the imagination as to what happened or what the creature is. Without posting spoilers, I felt like there was a slightly unsatisfying conclusion as to what had actually happened. But overall, I enjoyed the creepiness and darkness in this book, and it was a decent read.