For middle grade readers I’m going to cite examples of some good graphic novels, but with a little exploration, you’ll be able to find more good work.

The Adventures of Tintin
by Herge, published in the USA by Little, Brown (about 22 separate titles), ISBN 0316358398 – Tintin in Tibet
In this world famous series from a Belgian cartoonist, the intrepid boy reporter Tintin and his little white dog Snowy travel to the far corners of the world on all sorts of exciting quests.
WARNING: Some of these volumes contain stereotypes unacceptable today. Tintin in the Congo, The Red Sea Sharks, Land of Black Gold, and Cigars of the Pharaoh contain « mushmouf » black people. Tintin in America contains « redskin » Native Americans.