Harry Potter if that floats your boat. Expensive but alot of audio
At about that age, maybe a little younger we loved
“How To Train Your Dragon”. I think we actually had book 2 “How to be a pirate”. Nothing like the film and he is a very clever anti hero. The books are all written as if the are the memoirs of a great Chieftain remembering his disastrous child hood, when he is small, not good at fighting, terrible at training dragons but brave and clever
Beautifully read by David Tennant
We also loved “The little Darlings”
https://www.amazon.co.uk/Little-Darlings-Sam-Llewellyn/dp/0141316918
About kids who are naughty and a nanny agency taken over by criminals. I can still hear it in my head. Just some brilliant characters. Like ex Rock Star deaf Eric who calls out a nanny when he can’t find his kids. After the nanny finds them in the living room he say “They were on left! See I only looked to my right….”