There are many reasons why a book might be unavailable.
Sometimes a book goes temporarily out of print - and sometimes no audio version has ever been recorded. Audible wants to give you the most complete selection we can and we'll keep adding series and filling in gaps as quickly as possible.
I enjoyed the experience very much. It really made the words come alive. Thank you!
I loved this entire series....couldn't wait to hear the ending. I would recommend this book to anyone.