Nantucket is only two and a half hours away from Martha's Vineyard by ferry. But the two islands might as well be worlds apart for a set of identical twin sisters who have been at odds for years. Just because twins look exactly the same doesn't mean they're anything alike—and Tabitha and Harper Frost have spent their whole lives trying to prove this point. When a family crisis forces them to band together—or at least appear to—the twins come to realize that the special bond that they share is more important than the resentments that have driven them apart.