Sadie Gray is a runner. She always has been, she always will be. Right? She's at the peak of her Cross Country season, with record breaking times and intense training sessions, but before she can start her high school season, her world is flipped upside down. Sadie's life becomes a mess as she's diagnosed with a life-threatening form of Vasculitis. Takayasu Arteritis. Can Sadie balance high school, chasing her dream of being an olympic runner, and an auto immune disease?