New York Times bestselling author Tim Green has written an unforgettable story-inspired by interviews with real-life cancer survivors and insider sports experience--showing a brave boy who learns what it truly means to be unstoppable. National Ambassador for Young People's Literature emeritus Jon Scieszka says, Unstoppable is "absolutely heroic, and something every guy should read."

If anyone understands the phrase "tough luck," it's Harrison. As a foster kid in a cruel home, he knows his dream of one day playing in the NFL is a longshot.

Then Harrison...