Billius (Billie) Tennyson Wilson-Heart and Emily (Emma) Lorelei Bourne are the best of friends, growing up together in the same neighborhood. At the age of 12, Billie becomes famous for singing, leaving Emily to face middle school alone. Billie soon creates a band, the Flock of Tygers, with three other famous boys. One day, Emma is dared to text someone she hasn't talked to in a while, and chooses Billie's number.