Gina and Laurence have been the best of friends since childhood, but they’ve never been in love. For that, they chose others: Gina married Fergus, who gave her a daughter and a life of elegance and wealth, and Laurence wed Hillary, who helped him build a cozy, successful hotel and counts Gina among her dearest friends as well. But when one of these marriages ends, the result is a shift that sends tremors through three generations and two families—as friends become lovers, lovers become enemies, enemies become allies, and another marriage hangs in the balance.