Zoe Dalton seems to have it all: but a mysterious au pair threatens to unearth her past.

Zoe Dalton is a woman who seems to have it all: a successful business, a happy marriage, two beautiful step-children and a stunning house in the idyllic countryside. Yet beneath her positive exterior she is grappling with the agony of failed IVF attempts, and she carries a burden from her past; a secret she has held close to her for years. When a mysterious au pair enters Zoe's home with her own hidden agenda, Zoe is unwittingly propelled on a journey that will unearth a terrible truth and which will threaten to destroy everything she holds dear.