This fifth volume of The History of Middle-earth, edited by Christopher Tolkien, completes the presentation of the whole compass of his writing on those themes up to that time. Later forms of the Annuals of Valinor and the Annals of Berleriand had been composed, The Silmarillion was nearing completion in a greatly amplified version, and a new map had been made; the myth of the Music of the Ainur had become a separate work; and the legend of the Downfall of Numenor had already entered in a primitive form, introducing the cardinal ideas of the World Made Round and the Straight Path into the vanished West.
Closely associated with this was the abandoned time-travel story, The Lost Road, which was to link the world of Numenor and Middle-earth with the legends of many other times and peoples.
