Kai: Ninja of Fire - Farshtey, Greg

Will Kai be the greatest warrior ever known? Maybe, if he ever listens to Sensei Wu long enough to complete his training. He's stubborn, he's reckless, and he might just save the world.

Kai: Ninja of Fire 2011, Scholastic

ISBN-13: 9780545348270

Trade paperback

Kai: Ninja of Fire 2011, Turtleback Books

ISBN-13: 9780606363686

Turtleback School & Library edition