When Rosie Rankin's best friend has an affair with her husband, the consequences reverberate down through the lives of two families. Her daughter Daisy's fragile hold on reality begins to unravel when a letter arrives that opens up all the old wounds. Rosie's teenage son Max blames himself for everything which happened that long hot summer. And her brittle ex-husband Nick has his own version of events. As long-repressed memories bubble to the surface, the past has never seemed more present and the truth more murky. Sometimes there are four sides to every story.