H.I.V.E, also known as the Higher Institute for Villainous Education, is a book series geared toward those 7-12 years old.
It's a very good series, well-written and easy to understand. I've never had to read anything twice to know what's going on, and there's some very good foreshadowing within the story that the older readers will be able to pick up on. I have to admit, when I was reading Overlord Protocol, a bunch of conspiracy theories kept coming up in my head!
Let's hear what you think/thought!
Books in the series:
The Higher Institute of Villainous Education