Astrid Vasquez and her best friend Nicole can barely tolerate her mother’s regular Evenings of Cultural Enrichment until she surprises them with a roller derby match. For Astrid, it’s a life-changing experience: she’s hooked on roller derby, and is especially struck by the star player of the Rose City Rollers, Rainbow Brite. When she learns that there is going to be a roller derby summer camp for girls 12-17, she immediately signs up and assumes Nicole will, too. But Nicole has other plans for the summer. She wants to attend dance camp with Astrid’s long-time nemesis and Astrid feels betrayed.