The Book of the Long Sun is a tetralogy by Gene Wolfe, consisting of Nightside the Long Sun, Lake of the Long Sun, Calde of the Long Sun, and Exodus from the Long Sun. The first two volumes are also published together as Litany of the Long Sun, and the last two as Epiphany of the Long Sun. Gene Wolfe (born May 7, 1931) is an American science fiction and fantasy writer. ...

The saga begins with the attempt of Silk, a young priest, to save his manteion (the equivalent of a neighborhood church and school) from being destroyed by a ruthless businessman. However, Silk becomes a revolutionary leader and prophet as he learns more about his world (called the Whorl), its origins and fate, and the nature of the pantheon of gods he worships, and as he becomes a follower of a supposedly minor god known as the Outsider.

The Long Sun series has a sequel series, the Book of the Short Sun. The Book of the Short Sun is a trilogy by Gene Wolfe, consisting of On Blues Waters, In Greens Jungles, and Return to the Whorl. ...

While not precisely a sequel, the tetralogy is related to Wolfe's The Book of the New Sun. This relationship becomes clearer in the Book of the Short Sun. The first two books of The Book of the New Sun, 2000 omnibus printing. ...