No, I would suggest reading it for yourself.
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.
Loved it! Was so caught up in the story that I couldn't sleep until I finished it. Can't wait for the next book!