i can't resist a books thread!
We haven't got Spud Murphy on our shelves, so I'm working from memory as to its size and level of complexity. I think it's pluses are the exciting plot, funny jokes, and quality writing. Books along similar lines which might amuse at the moment are:
Anne Fine A sudden puff of glittering smoke - quite a challenging read in places but only 50 pages, and absolutely hysterical in places. (There are three others in a similar vein.)
Sally Gardner The invisible boy - another fun little story. 100 pages.
Dick King-Smith Happy Mouseday. This is a 'corgi pups' one, so probably on the easy side, but ds1 (7) recently read it and absolutely adored it. DS2 then read it too. It was so sweet to hear them discussing literature together ... Sorry, I digress.
Dick King-Smith Dragon Boy - I have a soft spot for this one as it was the first 'real novel' that ds1 read to himself. It's exciting, funny in places, and great writing. 180 pages, but quite approachable.
Theresa Breslin The Dream Master - this is the first in a series of ... ooh 4 so far from memory. 170 pp, bit more of a challenge than the others mentioned above. But VERY exciting!
Jenny Nimmo: Midnight for Charlie Bone - I tend to bang on about this one as well. 340 pp so another challenge. Some similar themes to Harry Potter, a real page-turner.
Has he read Harry Potter?