Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: I liked the book because it was action-packed.

The author has a way of writing that made me feel concern for the main character. After reading only a few pages I was drawn in. Brian Boru was very brave but he had many problems. After his home was burnt and his mother killed, he vowed to take revenge on the Vikings. When he picked fights to escape from his problems, his father sent him to a monastery where he learned to be a warrior and a scholar. Even so, he was scared when he went into battle. This was an historical book but it read like a novel. I learned about history by getting connected into the lives of the characters. In the end, Brian pays a price for going to war. If you want to find out exactly what happens, you'll have to read this book that I highly recommend.