Fifteen-year-old Isabelle Scott loves her life by the boardwalk on the supposed wrong side of the tracks in North Carolina. But when tragedy strikes, a social worker sends her to live with a long-lost uncle and his preppy privileged family. Isabelle is taken away from everything she's ever known, and, unfortunately, inserting her into the glamorous lifestyle of Emerald Cove doesn't go so well. Her cousin Mirabelle Monroe isn't thrilled to share her life with an outsider, and, in addition to dealing with all the rumors and backstabbing that lurk beneath their classmates' Southern charm, a secret is unfolding that will change both girls' lives forever.

Isabelle Scott and Mirabelle Monroe are still reeling from the revelation that they share more than just the roof over their heads. The media has pounced on their story, and while Izzie and Mira have each put on a happy public face, someone is leaking their true feelings to the press. It seems as if the world is watching their every move, but at least the girls have each other. With cotillion season right around the corner, however, Izzie and Mira have barely had time to process their newfound sisterhood. Mira has dreamed of making her debut in a gorgeous white gown forever—now if only she had an escort... Izzie, meanwhile, is still struggling to find her place in Emerald Cove, which seems ever more impossible with EC mean girls, young and old, trying to keep her down. As cotillion preparations heat up, there are dance steps to learn, manners to perfect... and secret initiations to complete? It's time for the gowns to go on and the gloves to come off.

How many secrets can one family keep? Amid preparations for Emerald Cove's extravagant Founders Day celebration and their own shared sweet sixteen, Isabelle Scott and Mirabelle Monroe are longing to break free from the tight constraints that come with being the daughters of a prominent public figure. When Izzie's estranged aunt, Zoe, breezes into town, the already uneasy family dynamic is turned on its head. Izzie's finally found her footing in Emerald Cove by leading the Social Butterflies, her school's prestigious club, and she has no interest in getting to know yet another long-lost family member. But Mira, who's on a mission to try new things and make new friends, is drawn to Izzie's artsy aunt. And when Mira meets a handsome, brooding painter, her entire perspective on life begins to shift. As tensions mount in Emerald Cove, Zoe's laid-back attitude appeals to both girls. But when she offers Izzie the chance of a lifetime, it's time to make a tough decision. What's more important: family or freedom?