I love the book series 1-2-3 for the book of A Cassidy Edwards Novel I wish book 4 we can listen to. I hope you be back in stock soon.
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.