The overall story is interesting, but the pace is too slow.
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.
Probably not. Having two narrators did not work very well for me.
It was an interesting storyline but the terrible narration took away from the audio book.