While zoning out in Chemistry class, Lily scribbles some of her favorite song lyrics onto her desk. The next day, she finds that someone has continued the lyrics on the desk, and added a message to her. Soon, Lily and her anonymous pen pal are exchanging full-on letters -- sharing secrets, recommending bands, and opening up to each other. Lily realizes she's kind of falling for this letter writer. Only who is he? As Lily attempts to unravel the mystery, and juggle school, friends, crushes, and her crazy family, she discovers that matters of the heart can't always be spelled out.