What if the person you were falling for was a total mystery?

While spacing out in Chemistry class, Lily scribbles some of her favorite song lyrics onto her desk. The next day, she discovers that someone has continued the song and added a message to her. Intrigued, Lily and her anonymous pen pal begin exchanging full-on letters--sharing secrets, recommending bands, and opening up to each other.

Before long, Lily realizes she's kind of... falling for this letter writer. Only, who is he?

As Lily attempts to unravel the mystery while juggling school, friends, crushes, and her big family, she discovers that matters of the heart can't always be spelled out...