On a perfect August morning, Elle Bishop heads out for a swim in the pond below 'The Paper Palace' - her family's holiday home in Cape Cod. As she dives beneath the water she relives the passionate encounter she had the night before, against the side of the house that knows all her darkest secrets, while her husband and mother chatted to their guests inside...

So begins a story that unfolds over twenty-four hours and fifty years, as Elle's shocking betrayal leads her to a life-changing decision