Daniel hosts a rooftop party, which he hopes will spotlight Sophi's talent; Katie is pleased when Luis returns to the island, but Cat fears that Katie will cause him heartache; and Jon attempts to win back Emily.
Katie faces the aftermath of her and Lou's beach sleepover, and an old pal helps her make a choice; Sophi weighs the consequences of a risky move as she pursues her dream; Taelyr and Cat form a surprising bond; Jon receives good news from his parents.
Jackie is enamored with Lou, but he's still fixated on Katie; an unlikely pair must sneak around; Cat warns Sophi to keep her distance from Ben; Sophi gets the courage to perform at an open-mike event; Katie opens up to Gabby about her love life.
Jon steps up his pursuit of Katie, much to Luis' chagrin; Jackie kisses Luis, igniting jealousy in Katie; Ben gives Sophi a tour of the island via boat; Jon and Luis' rivalry gets them in trouble at work.
Katie reaches a crossroads in her life; Ben share a secret with Cat; and Jackie wants to bond with her mom in the series premiere of this reality show, which follows a group of young adults who work and relax in Martha's Vineyard during the summer.