9 books in series

Dune

Dune is a 9-book series with 9 released primary works first released in 1965 with contributions by Frank Herbert, Brian Herbert, and Kevin J. Anderson.

Dune
Dune Messiah
Children of Dune
God Emperor of Dune
Heretics of Dune
Chapterhouse: Dune
Hunters of Dune
Sandworms of Dune
The Truths of Dune: Fear is the Mind Killer