I would only if I was SURE that they could enjoy the profound leaps of faith that this story, and the Event Group series in general, requires.
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.
Edit. Edit. Edit.A good iteration of the Event Group series, but goodness it seems so stretched out.