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.

Leah understands that what’s inside a home can be far more dangerous than what’s outside. So when she notices someone else who may be starting down the same path she’s on, she pays attention. She watches over McKenna from afar. Until one night she sees more than she bargained for. Leah knows she can’t save herself, but perhaps she can save McKenna.