Gary Paulson's book's are good for that age range. Most of his work is more serious in tone and survivalist (stuck in nature survivalist not doomsday bunker survivalist). Harris and Me is more biographical comedy.
O. Henry was my favorite author at that age, and still something that I revisit. It is written in an older dialect which can be a put off for some people.
That's a good age for mythology. Greek mythology is the easiest to find kid appropriate translations of but Norse mythology is full of daring rogue stories.
The Dangerous Book for Boys is a fun reference book.
Avalon
https://en.wikipedia.org/wiki/Avalon