To the outside world, Kathy is the very picture of a happy and fulfilled modern woman. She has a beautiful baby boy, a clever, handsome husband and a glamorous, high-powered job. But not everybody is fooled. Her employee, Hannah, knows the truth: the cracks in Kathy's marriage, her self-doubt, her fear of failure at work. Hannah is perfectly placed to destroy Kathy's life. And if she succeeds, she can claim the one thing she wants most.