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.

"Absolutely heroic, and something every guy should read." — National Ambassador for Young People's Literature emeritus Jon Scieszka

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 long shot.

Then Harrison is brought into a new home with kind, loving parents—his new dad is even a football coach. Harrison's big build and his incredible determination quickly make him a star running back on the junior high school team.

On the field, he's practically unstoppable. But Harrison's good luck can't last forever. When a routine sports injury leads to a devastating diagnosis, it will take every ounce of Harrison's determination not to give up for good.

With hundreds of thousands of devoted readers, Tim Green’s books are the perfect mix of accessible and heartwarming.

“I don’t know anyone–kid or adult—who won’t root heart and soul for Harrison. Unstoppable means you can’t put this book down!” —bestselling author Gordon Korman

He was a star on the field. Now he faces his toughest opponent yet.

Middle Grade Sports Fiction: Perfect for young readers who love action-packed football games and stories with a lot of heart.
An Inspirational Story: Inspired by real-life cancer survivors, Harrison's journey is a powerful tale about resilience, determination, and the will to never give up.
Dealing with Bullies: From a cruel foster home to rivals on the football team, Harrison must learn to stand up for himself both on and off the field.
A Heartwarming Read: More than just a sports book, this is an emotional story about finding a loving family and discovering what it truly means to be a hero.