There's a "free for a limited time" book for young teens available at Amazon & B&N. It's
The Magnificent 12: The Call by Michael Grant, published by HarperCollins. The description sounds like it's maybe a sort of urban fantasy adventure aimed at the 12-year-old or so age group. (It has better customer reviews at B&N than at Amazon.)
Apparently it is the first book in what will be a series. It was just released on Aug. 9, 2011. I'm not sure how long the "free" status will last.
Here's the book description from B&N (since Amazon doesn't yet have one):
"Twelve-year-old Mack MacAvoy suffers from a serious case of mediumness. Medium looks. Medium grades. Medium parents who barely notice him. With a list of phobias that could make anyone crazy, Mack never would have guessed that he is destined for a more-than-medium life.
And then, one day, something incredibly strange happens to Mack. A three-thousand-year-old man named Grimluk appears in the boys' bathroom to deliver some startling news: Mack is one of the Magnificent Twelve, called the Magnifica in ancient times, whatever that means. An evil force is on its way, and it's up to Mack to track down eleven other twelve-year-olds in order to stop it. He must travel across the world to battle the wicked Pale Queen's dangerous daughter, Ereskigal—also known as Risky. But Risky sounds a little scary, and Mack doesn't want to be a hero. Will he answer the call? "
For Amazon go
here.
For B&N go
here.