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.
Worth listening to! Deon Meyer is an excellent author and this book doesn't disappoint. Narrator does a good job.
Intense and enjoyable story of the detective sequel. I like the narrator as well - this is his 4th book I have listened to.