Many years ago, a wealthy lady, Mildred Story, suddenly broke off relations with her children and deprived them of their inheritance. The only explanation was a short note: “You know what you did.”

Years passed. Mildred's children grew up with children of their own. And then one day Millie, Aubrey and Jonah receive an invitation from their grandmother to spend the summer at her luxury resort hotel. The guys barely know each other and do not at all crave each other’s company, but their parents understand that this is a chance to return their mother’s favor...

But a warm welcome does not await them on the island, and they soon realize that their grandmother has completely different feelings for them plans. And the longer they stay here, the more they understand that the note is far from empty words. Twenty years ago, something happened in the Story family that changed the lives of their parents forever...