Instruct: Classify Amazon reviews into positive or negative sentiment
Query: The most bold and enduring book I have read.

Connie Willis takes on the daunting challenge of entering into the cultural context of the Black Death. She handles the effort with grace, power, and sensitivity. Her characterizations are simple and profound. The inclusion of the character Colin is insightful and effective. His youthful energy, enthusiasm, and penchant for breaking the rules provides just the right balance to the more weighty and tragic themes. Willis does not cut any corners in describing the reality of death and disease, but she manages to not let these passages dominate the overall trajectory of the story. Walking with Kivrin, we see the potential power of a single life lived by self-sacrifice. It is a novel with depth and beauty, one of the best.