The Return of the King (The Lord of the Rings, #3)

While the evil might of the Dark Lord Sauron swarms out to conquer all Middle-earth, Frodo and Sam struggle deep into Mordor, seat of Sauron’s power. To defeat the Dark Lord, the One Ring, ruler of the accursed Rings of Power, must be destroyed in the fires of Mount Doom. But the way is impossibly hard, and Frodo is weakening. Weighed down by the compulsion of the Ring, he begins finally to despair.