One of my novels, Yeller, is now available on Kindle. It's also available free to Amazon Prime members through the Amazon Lending Library. Yeller tells the story of Ben Lawson, a boy who's voice can bring down buildings. Imprisoned at Dr. Miller's Academy for Heroes, he must build a team of allies and escape before he gets sucked into a mad scientist's plans for world domination.
It's about 45,000 words long, and best for ages 10-14.