Splintered Light: Logos and Language in Tolkien's World (Revised Edition) - Verlyn Flieger

J. R. R. Tolkien is perhaps best known for The Hobbit and The Lord of the Rings, but it is in The Silmarillion that the true depth of Tolkien's Middle-earth can be understood. The Silmarillion was written before, during, and after Tolkien wrote The Hobbit and The Lord of the Rings. A collection of stories, it provides information alluded to in Tolkien's better known works and, in doing so, turns The Lord of the Rings into much more than a sequel to The Hobbit, making it instead a continuation of the mythology of Middle-earth.