The Book of Lost Tales
J. R. R. Tolkien's The Fall of Gondolin is one of the stories which formed the basis for a section in his posthumously-published work, "The Silmarillion", with a version later appearing in "The Book of Lost Tales". A stand-alone, book-length version of the story was published in 2018. "The Fall of Gondolin" is one of three stories from the First Age of Middle-earth to be published as a stand-alone book: the other two are "Beren and Lúthien" and "The Children of Húrin".