Massie Dylan has had a crush on her next door neighbor Calum Hood for as long as she can remember. The hair, the eyes, the Australian accent. What's not to love? So when she hears he likes girls who are into rock bands, she grabs her beanie and her brother's Blink 182 CD and becomes a fan of Calum's band, 5 Seconds of Summer. She thinks this is her chance for Calum to notice her and is sure Calum is the one for her. But what happens when she meets the newest drummer in the band Ashton Irwin?