Unstoppable tells some inspiring stories about Jason Leicester in his games. The author of the book manages to uncover the Jason Leicester's growth experiences from a disabled man to a great triathlete. In the book, Jason shares with readers not only his passion, perseverance and strength in face with the extreme challenges, but also his life principles for overcoming difficulties and achieving great goals. From the story of Jason Leicester, readers will understand how a runner with belief stands up in the adversity and finally realizes his dream.