Alison and Charlie, Claire and Ben seem like two picture-perfect couples. Alison and Charlie have a beautiful family and a home in the suburbs, while Claire and Ben's marriage revolves around their careers and city-based lives. Despite their differences, the two couples have remained close friends for ten years.

But one terrifying moment in the dead of a New Jersey night will quickly—and unexpectedly—expose the fractures and stresses that lie beneath the surface. Alison and Claire, best friends since childhood, are now worlds apart. And as each of them tries to find a way forward, all four will be forced to examine the choices they have made and the lives they have built, and ultimately to ask themselves: What is happiness? Does true human nature lie in our wanting or in how deeply we allow our desires to consume us?

Four people, two marriages, one lifelong friendship: Everything is about to change.