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.