Jessica (HDB)

I'm putting forth this question to you, my dear bookish friends, because I'm burnt out and can't come up with any ideas.

I have a friend who is looking for books her 12 year old son might like. He's read the Fablehaven series and liked it. He's also read the Jack Blank series and loved them.

Anyone know of anything else he might like? She wasn't able to tell me anything beyond those two series, both of which are fantasy based, but I'm willing to take any ideas!

Books for a 12 year old boy?

Thanks for your mental energy and suggestions!