Lemony Snicket's A Series of Unfortunate Events has become very popular in our house. It's a series of 13 books. DD, 7, nearly 8, started them a few months ago, and loves them. We do a bit of me reading/her reading. They are funny and dark humoured. Language stretches dd, but she gets the gist. Would def recommend. Not heard the audio versions - but the stories are pretty gripping, could def work for a car journey.