The theme of HERO is discovering you inner talents. Zach needs to be alone in order to discover his hidden superpowers. This happens many times in Central Park. Throughout the book, Zach begins to understand things better and that the world is more complex than what he thought when his Dad was alive. He becomes tougher and more independent as he discovers his powers. The more he understands his powers, the more responsibly he uses them. At the end of the book, he is ready to take on adult responsibilities and follow in his father’s footsteps.