The instant New York Times bestseller is "a fun, delightful, un-putdownable novel" about two identical twin sisters who couldn't look more alike . . . or live more differently (PopSugar).

Nantucket is only eleven miles away from Martha's Vineyard. But they may as well be worlds apart for estranged twin sisters Harper and Tabitha Frost.

After not speaking for more than a decade, Harper and Tabitha switch islands-and lives-to save what's left of their splintered family. But the twins quickly discover that the secrets, lies, and gossip they thought they'd outrun can travel between islands just as easily as they can. Will Harper and Tabitha be able to bury the hatchet and end their sibling rivalry once and for all?

Before the last beach picnic of the season, there will be enough old resentments, new loves, and cases of mistaken identity to make this the most talked-about summer that Martha's Vineyard and Nantucket have experienced in ages.