Leah and McKenna have never met, though they have parallel lives.

They don’t—ever—find themselves in the same train carriage or meet accidentally at the gym or the coffee shop.

They don’t—ever—discuss their problems and find common ground.

They don’t—ever—acknowledge to each other that although their lives have all the trappings of success, wealth and happiness, they are, in fact, trapped.

Because Leah understands that what’s inside a home can be more dangerous than what’s outside. Driving past McKenna’s house one night, she sees what she knows only too well from her own marriage: McKenna’s “perfect” husband is not what he seems. Leah decides to keep watch over McKenna, until one night, she intervenes, and sets into motion events that will change both their lives forever.

Leah and McKenna have never met. But they will.