As friends and fellow members of the literary circle known as The Inklings,J。R。R。 Tolkien and C。 S。 Lewis embarked on a challenge。 Lewis was to write on "space-travel" and Tolkien on "time-travel。 Lewis' novel, Out of the Silent Planet, became the first book of a science fiction trilogy。 Tolkien's unfinished story, "The Lost Road" chronicles the original destruction of Númenor, a pivotal event of the Second Age of Middle-earth。
In this fifth volume of The History of Middle-earth。
Christopher Tolkien traces the history of Middle-earth, bringing the land -its topography and ever-clashing forces- to the state readers recognize from The Lord of the Rings。