Kelly Mendes, also known as Shawn Mendes's sister, goes from living in Canada to living in New Jersey. In New Jersey she meets her new best friend Vicky. Kelly continues helping Shawn with his music until he leaves for tour one day. Kelly decided to live with her best friend Vicky until Shawn returns from Magcon. Vicky and her family decides to leave for vacation and Kelly was left with Vicky's two brothers. What Kelly didn't know, and nither does anyone else, is that Vicky is part of the dolan family. The dolan twins is actually Vicky's older brothers. Kelly is forced to live with brothers for the summer. Kelly and the twins didn't get off on the right foot. A unexpecting twist happenes. The twins and Kelly become best friends! They start doing everything together! Videos and more! But Kelly falls in love with one of the twins. Another twist is that both the twins fall in love with Kelly. Which twin does Kelly fall in love with? And what will happen at the end of the summer?