The Flame Imperishable: Tolkien, St. Thomas, and the Metaphysics of Faerie, Hardcover/Jonathan S. McIntosh

J. R. R. Tolkien was a profoundly metaphysical thinker, according to this new study of his works. The Flame Imperishable follows the thought of Aquinas as a guide in laying bare the deeper foundations of many of the more familiar themes from Tolkien's legendarium, including such notions as sub-creation, free will, evil, and eucatastrophe.