It’s the first real day of summer: the day Belly, her brother Steven, and her mother Laurel head to Cousins beach to stay with Susannah Fisher, who’s like Belly’s second mother, and her boys, Conrad and Jeremiah. Belly’s been going to Cousins since she before was born, but something about this summer feels different for Belly. And if the first night is any indication, she’s right.

It’s the 4th of July, and the fathers have come to Cousins for Susannah’s annual party at the beach house. Tensions flare between Conrad and his father. Belly and the Fisher brothers make margaritas, and chaos ensues. Later, Belly has a romantic moment that's interrupted.

The debutante ball is here, but Belly’s big night is almost ruined when Jeremiah learns the secret his mother has been keeping all summer. When Belly’s left alone on the dance floor, someone else steps in to save the day. With Susannah and Laurel’s secret out in the open, the season ends with a promise from Susannah and the confession from Conrad that Belly has been waiting for all summer.

Belly's not the same girl she was at the end of last summer. It's the last day of school, and, after a tough year, Belly tries to let loose with Steven and Taylor, but some things are too big to leave behind.

The summer house is for sale, but Belly, Jeremiah, and Conrad won’t let it go so easily. While Conrad works on a secret plan, Belly and Jeremiah try a more direct route. But being back in Cousins with the Fisher brothers means Belly can’t escape painful memories of the past year.