I have listened to the entire series, purchased the right title, right author. it's the wrong book when I listened to it
This book was great! I really enjoyed it, even though the first series was better!
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.