The two novels combined in this omnibus (Caldé of the Long Sun and Exodus from the Long Sun) comprise the second half of Gene Wolfe's long novel, The Book of the Long Sun.
Gene Rodman Wolfe (1931-2019) was an American science fiction and fantasy writer. He was noted for his dense, allusive prose as well as the strong influence of his Catholic faith. He was a prolific short-story writer and novelist and won many science fiction and fantasy literary awards.
Wolfe is best known for his Book of the New Sun series (four volumes, 1980–83), the first part of his "Solar Cycle". In 1998, Locus magazine ranked it the third-best fantasy novel published before 1990 based on a poll of subscribers that considered it and several other series as single entries.