Zinnia is stuck. Even though her family moved across the country for a "fresh start" after her little brother's death, Zinnia Helinski still feels like she's waiting for her new life to begin. Just as sixth grade is starting, Zinnia spots her neighbor Kris climbing down the fire escape of their apartment building. He's wearing a black eye mask! And...a blue spandex bodysuit? Soon Zinnia finds herself in a secret club for kids who want to be heroes. The Reality Shifters don't have superpowers, but they do have the ability to make positive change in their neighborhoods. And a change is just what Zinnia is looking for! At first, she feels invincible. Zinnia finally has friends and is on the kind of real-life adventures her little brother, Wally, would have loved. But when her teammates lose sight of their goals, Zinnia must find the balance between bravery and recklessness - and learn that not all heroes need capes.