None of them would forget that week on the wild Norfolk coast. Best friends Rosie and Lisa's families had always been inseparable. But that summer, Lisa had an affair with Rosie's husband Nick. And now, after years of silence, she sends Rosie a letter begging for help. A letter which exposes dark secrets. Daughter Daisy's fragile hold on reality begins to unravel. Teenage son Max blames himself for everything that happened that long hot summer. And Nick must confront his own version of events. There are four sides to this story. Who will you believe?