Books for a very able 7 year old boy

[umptyflump]

We've come to a halt with accelerated reader at school as DS has now reached level 5.6 and there are no 'lower years' books left. We have an agreement with school that he will carry on with his own reading and take those books into school, but he's exhausted his own well-stocked shelves and those from the library. We sometimes struggle with moving on to harder books as the subject matter can often be ahead of him emotionally. Anyone have any inspiration?

[PhilODox]

Not Alex Rider at 7! He's a child that kills children...

For more advanced readers, go old.
The writing in the past in children's books was far more sophisticated than the language used today.

Some good suggestions above (particularly Stig, which was a great favourite of my DS at that age)
Also:
Weirdstone of Brisingamen
The Coral Island by RM Ballantyne
Around the World in Eighty Days (maybe read to him, rather than him read)
Treasure Island (again- the full unabridged version can be scary in places, so maybe you read to him)
Roger Lancelyn Green's books- Norse Tales, King Arthur, Greek Tales etc
Chronicles of Narnia
The Hobbit
The Indian in the Cupboard
The King of the Copper Mountain

I think HP can be quite dark, so we have kept them back (DS is 9, and has read first three only. HO&GoF has a death, that I still think would upset him)
The How To Train Your Dragon series though is fantastic- very well written, lots of sophisticated language, a huge story arc (12 books), though it keeps the pace up constantly.
The Phillip Reeve books with Sarah McIntyre are very good too, very droll.
Alan Snow's Here Be Monsters is something I recommend to everyone because it's so darn good! (The boxtrolls film was based on it, loosely mind!)
The Animals of Farthing Wood is good.

[BothersomeCrow]

Asterix is great, often lots of them in local libraries.
Marcia Williams graphic novel versions of Greek myths, bible, Chaucer etc
Horrible Histories and Murderous Maths
Diana Wynne Jones' Chrestomanci books
Edith Nesbit

[leeloo1]

Not rt(whole)ft, but ds at 7 loved the Polly and the Wolf stories, and they really are good reads. Also Jack stalwart (Alex Ryder type books for younger children, so nothing too worrying or scary, ds reads A. R. now at 9). He had read the my naughty little sister books around then, also a lot of the Flat Stanley books and a few Enid Blytons. He got into beast quest about then too and from there to Greek and roman mythology. He also loved the big usbourne non fiction books - space, human body etc and the book people do sets about quests, that are a mix of stories and puzzles, which he found good fun.

I remember worrying about his reading 'stamina' (and the vocabulary that would have come from more challenging books), as he didn't want to attempt any longer books that technically he 'could' have read at that age. But that came gradually (well, tbh when he saw a massive 3" thick book about Greek myths that he was desperate for it overruled his resistance to longer books!) and now he has a reading age/comprehension of 16yrs (I only know as school tested him) and is happy to read weighty tomes (and is usually found with his nose in a book). Only adding this as I feel now that as long as he was reading something/anything, the stamina would come in time - but I wished I'd known not to worry 2-3 years ago. :)

[yikesanotherbooboo]

I've lost track here a bit but loads of inspiring suggestions. At that age as well as the usual Enid blytons I loved Arthur Ransome , Edith Nesbit Mary Poppins and Doctor Doolittle. I also read and reread books and was aware that I was missing some detail. Soon afterwards ( aged 9) I moved on to Laura ingalls wilder . LMMontgomery and then on to Agatha Christie, Georgina Heyer.
As a child, and to this day, I liked to mix and match hard reads and old favourites. Nothing wrong with reading Mr Gum for the umpteenth time followed by by 5 children and it followed by some sort of mine craft manual, All reading is good.