"Ready!" is the first e-book in King of the Marshmallows, a series of short stories for children and teens published by Echelon Press (publisher of Killer Cows). Mark has Asperger's Syndrome, and has a hard time at school. Mom's looking for solutions, and ends up signing him up for taekwondo classes, where ends up in a class with both adults and kids. And one of the other kids also has Asperger's Syndrome.
Mark also figures out how to deal with his book report at school -- and ends up reading one of my favorites, Mockingbird!
Author Lydia Ondrusek is a friend of mine, so I can't claim objectivity here. But I thoroughly enjoyed the story, and look forward to the next installment (the first one is only about 3000 words). I would suggest this story for kids ages 9-14 (or younger if they read well).
"Ready!" is available through SmashWords for only 99 cents! You can read it either online with a regular computer or on an e-reading device.