Even though her family moved across the country for a "fresh start" after her little brother’s death, eleven-year-old Zinnia still feels like she’s stuck waiting for her new life to begin. Then she spots her neighbor, Kris, climbing down the fire escape of their apartment building wearing a black eye mask, Spandex leggings. . . . And a blue body suit?

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 power 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 would have loved. But when her teammates lose sight of their goals, Zinnia must find the balance between bravery and recklessness, and learn to be a hero without her cape.