Bronx Justice is a prequel of sorts done badly. I do not see the point of this case; it was a strange place for Jaywalker to look back on.
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.
Absolutly. For me, the audio edition is always better, I may never read again.