The Tolkien novel divided into The Fellowship of the Ring, The Two Towers and The Return of the King is The Lord of the Rings.
Tolkien wrote The Lord of the Rings as a single extended work, but its publisher released it in three volumes for practical and financial reasons. The Fellowship of the Ring appeared in 1954, followed by The Two Towers and The Return of the King in 1955.
The story follows the attempt to destroy the One Ring, an object that gives its maker Sauron power over Middle-earth. Frodo Baggins carries the Ring toward its destruction while several companions and allied peoples resist Sauron’s forces.
The trilogy is sometimes described as three separate novels, but Tolkien regarded it as one work. The three-volume structure is a publishing arrangement, not three unrelated stories. The 2001–2003 film adaptations used the same three-part division.