Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Excellent

This little book is an excellent companion to all of Tolkien's books about Middle Earth. I found that Purtill's insights -- informed by his Catholic faith -- were fresh and illuminated the Catholicity of Tolkien's work. His explanation of why Tolkien felt impelled to create his own Brittish Myth was interesting too. The book was a quick and easy read.