Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Maisie Dobbs is a worthwhile historical novel.

The World War I era doesn't get much attention, and Maisie Dobbs is a heroine worth knowing.She is fortunate to have had mentors, like Dr. Maurice Blanche and Lady Rowan, as well as a loving father.This book focuses on Maisie's background as she begins her Trade and Personal Investigations business.