I'm looking for graphic novel recommendations for DS9, almost 10. He has read the Amulet books, many Tin Tins, lots of comics (particularly Calvin & Hobbes) and a truckload of Geronimo Stiltons. It's not a category I'm familiar with, so I could really use some help. He's an avid reader of non-fiction, but less keen on fiction and I'm hoping graphic novels will bridge the gap. Many thanks.