Absolutely - the plot was interesting and the characters were well written.
I really enjoyed the entire "against" series. I wasn't totally invested in Brodie. it was a good story but the others were 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.