I’m levelling up on books and I want your recommendations!

Hello! My son (4 y/o) loves books and I want to get into longer form stories. Like a novel. What are you reading to your kids that are a little more sophisticated than 10 minute picture books?

I remember when I was a kid:

Mathilda, Stuart little, A Secret Garden. And I will get these, but wondering if there are any new materials that your kiddos are into?