The Lord of the Rings: The Return of the King

J. R. R. Tolkien

Book 3 of the Lord of the Rings

The Dark Lord Sauron has regained much of his old power, and as he unleashes hordes of orcs to conquer all of Middle-earth, Frodo and Sam struggle deep into Mordor, seat of Sauron's power.  To defeat Sauron, the One Ring, ruler of all 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.