Instruct: Classify Amazon reviews into positive or negative sentiment
Query: I couldn't put it down.

Galen's Lectures is one of those books that grabs your attention in the first line, and doesn't let go until the last. Doctor Galen is a honorable man just trying to get through his day like the rest of us. What appealed to me was his compassion for others and his love of teaching. I was enarmored with him during that first encounter on the wharf, and cheering for him every second afterward. And when the story was over, not only did I have a better understanding of chemistry, but I was really glad I got to know Mason Galen. This is one of those rare novels that you can read again and again and again.