Samantha Rushford's future looks bright: the high school art teacher is getting ready to leave Mirror Lake and move to Boston with her ambitious boyfriend, and she hopes a diamond ring is just around the corner. But her past still has a hold on her - especially the bittersweet memory of her rebellious ex, who kissed her passionately before he left town without a word.

Since then, Lukas Spikonos has parlayed his rebel ways into life as an up-and-coming recording artist. When he shows up for a surprise gig at the high school prom, Sam is more dumbstruck than starstruck - he used the words of a poem she wrote about their breakup to create a number one hit. But Lukas hasn't returned just to impress students; he's facing some real-life responsibilities and needs Sam's help. But she has her own unresolved issues about the life she wants to lead. Will the music - and the pull of true love and family - put their hearts back in harmony?