It's wintertime in the Hamptons, where Scott and his wife, Elise, have come to be with her terminally ill father, Victor, to await the inevitable. As weeks turn to months, their daily routine--Elise at the hospital with her father, Scott pretending to work and drinking Victor's booze--only highlights their growing resentment and dissatisfaction with the usual litany of unhappy marriages: work, love, passion, each other. But then Scott notices something simple, even innocuous. Every night at precisely eleven, the lights in the neighbor's bedroom turn off. It's clearly a timer...but in the dead of winter with no one else around, there's something about that light he can't let go of. So one day while Elise is at the hospital, he breaks in. And he feels a jolt of excitement he hasn't felt in a long time. Soon, it's not hard to enlist his wife as a partner in crime and see if they can't restart the passion. Their one simple transgression quickly sends husband and wife down a deliriously wicked spiral of bad decisions, infidelities, escalating violence, and absolutely shocking revelations.