School is officially back in session. Between Sara's growing feelings for her dream girl and Tegan's falling- out with her former BFF, eighth grade might prove to be even messier than last year. Onstage, the twins are swept up in a battle-of-the-bands contest to open for their favorite musical artist, landing them with a new manager, new opportunities, and new challenges, too. But stepping into the spotlight-and into their true selves-means colliding over fame, family, and finding their sound.