In the quaint town of Cefalú, Sicily, where everyone knows everyone, Sofia Evans, a young British student, finds herself spending her summer before leaving for university, with her Italian relatives. Shawn Mendes, a hardworking, internationally renowned singer, is in need of a break, and finds himself winding up in the same small, quaint town of Cefalú. But with Sofia unaware of his global presence, and Shawn unwilling to tell her the truth, will it be the summer they were hoping for, or will they wish it never happened?