Hi Sarah,
We’ve published the installments in approximate CD length segments. All four of those segments are from Book I, and the next one we publish, in two weeks will have the end of Book I on it.
Basically Book I is an allegory, kind of like Pilgrim’s Progress, for children to learn about, think about, understand their characters. It’s fine for anyone to listen to. Though you will probably want to have your younger children “study” the book again when they are old enough. And of course, there is much food for thought for adults as well!
Emily Cottrill
http://www.livingbookslibrary.com