The Book of the Long Sun

1. 

   Book 1

   Nightside The Long Sun (Book of the Long Sun)

   Gene Wolfe

2. 

   Book 2

   Lake of the long sun

   Gene Wolfe

3. 

   Book 3

   Caldé of the Long Sun

   Gene Wolfe

4. 

   Litany of the Long Sun (Book of the Long Sun)

   Gene Wolfe

Book data and covers from Open Library (openlibrary.org).