Junior Nattie McCullough is totally OK with her place in life: Latin whiz. Member of the school's gay-straight alliance. Joni Mitchell superfan. Seventeen-year-old who has never been kissed. So when last summer's crush and her former classmate--Young Lungs lead singer Sebastian Delacroix--comes back to town with his new hit single "Natalie," she can't bring herself to believe it could possibly be about her...could it?

As Nattie sorts through the evidence (the lyrics, Sebastian's elusive text messages, and their brief romantic encounter last year), the song's popularity skyrockets, and everyone starts speculating about "Natalie's" identity. If that wasn't mortifying enough, Nattie runs into another problem: her confusing, flirtation-packed feelings for her good friend Zach. With her once-average life upended, Nattie is determined to figure out once and for all if her short-lived past with Sebastian was something love songs are made of--or just a one-hit wonder.