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.
The story wrapped up way too quickly. The characters were in love too quickly... Not realistic. One of the voices for the cop was redoculus.
I like most of the books by this author, but this one didn't hold my attention.