Free-spirited Lily has always played the peacemaker between her fierce, doting sister, Laverne, and her own loving, garrulous husband, Hal, as they competed for her attention. The competition has only grown worse since the three of them moved into a large house in the town of Sussex, New Brunswick. On Lily's 58th birthday, a steamy day in late June, Laverne feels she has bested Hal by winning her sister's company for a gourmet lunch, but it becomes a bitter and short-lived victory when the day's events take an unexpected and tragic turn.