Get ready to hit a high note with Austin and Ally! As Austin prepares for his big comeback concert, he runs into a string of bad luck, but the show must go on. Ally is determined to graduate and attend Harvard, but will a lost library book get in her way? And, Trish struggles to keep a band she manages from breaking up, while Dez tries to make one last movie with his friends before he heads off to film school. The future may be unknown but as long as these friends have each other, they'll be in perfect harmony!