Heretics of Dune is a 1984 science fiction novel by Frank Herbert, fifth in a series of six novels. It was ranked as the #13 hardcover fiction best seller of 1984 by The New York Times.
Seems this might be available again ..
(though it doesn't look like the CD release happened .. ?)
Audio Collectors Items:
Would also like ..
Sandworms of Dune - TC 1565
Battles of Dune - TC 1601
The Truths of Dune: "Fear is the Mind Killer" - TC 1616