嗄 coming of age story set in New York, Sisters on Track is about hope, belonging, and the metaphorical and literal sisterhood of young athletes Tai, Rainn, and Brooke Sheppard.嗄 coming of age story set in New York, Sisters on Track is about hope, belonging, and the metaphorical and literal sisterhood of young athletes Tai, Rainn, and Brooke Sheppard.