I haven't read any and don't know where to start. I did pick one up that was lying around at home as a teen and couldn't get into it, but I'm thinking it wasn't one of the easy to get into ones, judging by posts I've read on here.
I don't know if they are too old for him?
He likes science fiction type of stuff, with humour, has finished the hitchhiker's guide. Any other recommendations are welcome!