The book, which was edited by his son Christopher Tolkien, tells the fate of lovers Beren, a mortal man, and Lúthien, an immortal elf, which became part of The Silmarillion, a collection of the writer's works on the First Age of Middle Earth. . . .
According to Tolkien specialist John Garth, the author used his writing to escape the atrocity he witnessed in World War One. . . .