The standard hardcover edition of the second volume of The Lord of the Rings includes a large format fold-out map. Frodo and his Companions of the Ring have been beset by danger during their quest to prevent the Ruling Ring from falling into the hands of the Dark Lord by destroying it in the Cracks of Doom. They have lost the wizard, Gandalf, in a battle in the Mines of Moria. And Boromir, seduced by the power of the Ring, tried to seize it by force....

The Companions of the Ring have become involved in separate adventures as the quest continues. Aragorn, revealed as the hidden heir of the ancient Kings of the West, joined with the Riders of Rohan against the forces of Isengard, and took part in the desperate victory of the Hornburg. Merry and Pippin, captured by Orcs, escaped into Fangorn Forest and there encountered the Ents. Gandalf returned, miraculously, and defeated the evil wizard, Saruman.

...

In The War of the Ring Christopher Tolkien takes up the story of the writing of The Lord of the Rings with the Battle of Helm's Deep and the drowning of Isengard by the Ents. This is followed by an account of how Frodo, Sam and Gollum were finally brought to the Pass of Kirith Ungol, at which point J.R.R. Tolkien wrote at the time: 'I have got the hero into such a fix that not even an author will be able to extricate him without labour and difficulty'....

In this sixth volume of The History of Middle earth the story reaches The Lord of the Rings. In The Return of the Shadow (an abandoned title for the first volume) Christopher Tolkien describes, with full citation of the earliest notes, outline plans, and narrative drafts, the intricate evolution of The Fellowship of the Ring and the gradual emergence of the conceptions that transformed what J.R.R. Tolkien for long believed would be a far shorter book,...