Unfinished Tales
"The Quest of Erebor" is a work of fantasy fiction by J. R. R. Tolkien, posthumously published by his son Christopher Tolkien in "Unfinished Tales" (1980). This work explains how and why Gandalf arranged for the retaking of the Lonely Mountain ("Erebor" in Sindarin), an adventure recounted from the perspective of the eponymous Hobbit, Bilbo Baggins, many years before, in Tolkien's "The Hobbit".