Harper Frost, laid-back and easygoing, has inherited her father’s rundown house on Martha’s Vineyard. Tabitha Frost, dignified and refined, has inherited a flailing fashion boutique on Nantucket. After more than a decade apart, 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. 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.