One shimmeringly hot Sunday in May, the Delaneys open their pool to the whole village for charity. Louise is there with her daughters, and while the children splash and shriek in the cool blue waters, she basks in the sunshine, attempting to ignore her estranged husband and dreaming of the new man in her life, a charismatic lawyer. The day seems perfect.

Then a sudden and shocking accident changes everyone's lives forever. Recriminations start to fly. Whose fault was it? Louise's new lover insists that she sues the Delaneys. Her ex-husband isn't so sure. Opinion in the village is split. Old friendships start to crumble. New ones are formed. Will the repercussions from the accident ever end?