Harry Potter and the Prisoner of Azkaban

So we've started on a new spoken word CD series listening to Harry Potter and the Prisoner of Azkaban. We have now discovered just how effective this is for passing time on long car journeys. It's good for at least two hours. R* is addicted. I've read the book but my memory needs refreshing as I haven't read the book that comes after it yet. The series is 10 CD's long so that means we've got 6 more hours of driving we can do! :-)