LibriVox has some good Catholic books you can listen to.

I have found biographies of St. Anthony, St. Teresa, Cure of Ars, etc.  And also some "murder" mysteries by Margaret Hubbard which take place in/around convents, tame by modern standards but I found them quite diverting during a 14 hr car trip.

They also have Catholic non-fiction like St. Irenaeus Against Heresies and the Practice of the Presence of God by Brother Lawrence among others.  There are also some great Catholic children's books too.  It's amazing what you can find when you do a little digging.

Many of the books can be subscribed to by podcast if you have an iProduct.