Best friends Carly, Daniella, Lainie, and Penny - aka the self-proclaimed #SummerSisters - have been coming to the New Jersey shore town of Ocean Park Heights ever since they could remember. And every year, the girls make a bucket list and dedicate their entire summer to completing every item on it, documenting their wacky escapades on FotoSlam for everyone to see. It's their tradition, and as long as the Summer Sisters had each other, the rocky jetty on the shore, and their bucket list, that would never change. Right?

But then, tragedy strikes after Carly - the mastermind behind the bucket list- unexpectedly passes away. As the remaining Summer Sisters try to wrap their heads around their best friend's death, life seems determined to throw more curveballs at the girls, threatening to split the Summer Sisters up for good. Daniella is accepted to a prestigious music academy in New York City, Lainie finds out her family is moving to Florida and leaving Ocean Park Heights for good, and Penny struggles to find her footing as she feels ready to leave childhood behind more quickly than either of her friends. What will hold them together with Carly gone and the Summer Sisters seemingly over?

Then, Daniella finds Carly's final bucket list. And just like that, the Summer Sisters are back! But of course, things don't always go as planned, and the girls try their hardest to navigate grief, loss, and coming-of-age woes while keeping the Summer Sisters - and Carly's memory - alive.