If you have 4-5th graders, you might like reading through 4th grader Maria's book list. She shares her top 50 books from 4th grade here.
I haven't read all of these books, so I can't give my full recommendation, but I highly respect Maria's family, so I'm sure they are top notch quality!
Did you know that "Reading for Pleasure" is one of the 40 Assets that contributes to positive youth development? It's such an important skill and habit!