'We'll Always Have Summer', leaves the beloved characters Belly and Conrad forever united in infinity having just married. But what will happen next to this young couple and their families Laurel, Steven, Mr. Fisher & of course Belly's second love, Jeremiah? What do the future summers look like in Cousins in Susannah's once loved beach house?

Belly has just returned from her trip to Spain, and now, with Mr. Fisher's permission, she is heading up to Cousin's for a personal vacation. She made sure that neither Conrad nor Jeremiah were planning on going to the beach house when she was going to be there, but she doesn't even know how long she's going to stay. The house is just as she last remembers it, but almost too much.