10yr old boy reading age 14

Have you tried him with graphic novels? They are a really good gateway to reading and there are so many out there which are not just children's 'comics' but have actual storylines and require attention and reading.

If he likes a bit of horror/ something a bit dark, Locke and Key might interest him, and there's also a TV show of it on Netflix so he could read and watch.

Other good ones are Bone, Ms Marvel, or even just the general Marvel stories (although you have to be selective and find the good ones).

You could try Infinity Gauntlet: www.amazon.co.uk/dp/0785156593?ascsubtag=grd-gb-7169817235483885000-20&geniuslink=true&tag=mumsnetforu03-21

If you have a tablet/ device, you can get a subscription to Marvel online with unlimited access to their comics. It could be perfect for him.

www.marvel.com/unlimited

There’s an abridged version of The Da Vinci Code which is suitable for that age www.penguin.co.uk/books/298/298406/the-da-vinci-code--abridged-edition-/9780141372563.html

DS enjoyed the Mission Survival series by Bear Grylls and then read his autobiography Mud Sweat and Tears. If your son likes non-fiction, then there’s a survival guide called How To Stay Alive which DS enjoyed too.

If he enjoyed Diary of a Wimpy Kid and wants something similar but a bit harder, then try:
Max Grumbly
Kid Normal
I Funny
Timmy Failure

If he liked the graphic novel format of Captain Underpants, then I’d suggest Big Nate or The Last Kids on Earth

Terry Pratchett's discworld - but not in the published order! You could start with the ones written for younger readers, or if you think he'd rather read a "proper one" I would say start with the guards series, beginning with Guards! Guards! and then Men at Arms. If he gets into them he can go back and read the others, though the first three aren't as good as the rest. There will be a lot in there that goes over his head, but there's nothing inappropriate, the plots are great, they're funny, and there's a real richness in the language.

If he was a reluctant reader, I'd let him read stuff that interests him.
I also be wary of going upto his reading age because the themes aren't particularly suitable.

Terry Prachett?
Alex Ryder?
Percy Jackson?
Harry Potter?

What are his interests? We got DS2 reading by finding a series about cats....

Harry Potter? I'm mostly just here to follow to rob some ideas for DSS

Take him shopping and see what he picks up? Ds2 is 10 and likes things like Pages and Co, the Morrigan Crow series, Adventures on Trains, Dragon Mountain and Skullduggery Pleasant.

I loved and still frequently re-read the edge chronicles, beyond the deepwoods was the first I read but it's technically the fourth book, there are sky pirates in some, there are some illustrations, the stories are suitable for teenage reading ages with nothing I would consider inappropriate as a topic even for younger children.