When Alexis and her husband Sam buy a neglected Cape Cod house in an exclusive DC suburb, they are ecstatic. But the neighbourhood’s picture-perfect image is shattered when their neighbour Teddy – a handsome, successful father of three – is found dead on the steep banks of the Potomac River. The community is shaken, and as the police struggle to identify and apprehend the killer, tension mounts and long-buried secrets start to emerge. Alexis takes comfort in her budding friendship with Teddy’s beautiful and charismatic widow, Blair. But when the unthinkable truth behind Teddy’s murder is finally uncovered, both Blair and Alexis must reexamine their friendship and decide how far they are willing to go to preserve the lives they have so carefully constructed.