Robin and Sarah weren't the closest of twins. They weren't even that similar. But they loved each other dearly. Until, in the cruellest of domestic twists, they were taken from one another.

Now, in her early 30s, Robin lives alone. Agoraphobic and suffering from panic attacks, she spends her days pacing the rooms of her house. The rest of the time she watches - watches the street, the houses, the neighbours. Until one day, she sees something she shouldn't...

And Sarah? Sarah got what she wanted - the good-looking man, the beautiful baby, the perfect home. But she's just been accused of the most terrible thing of all. She can't be around her new family until she has come to terms with something that happened a long time ago. And to do that, she needs to track down her twin sister.

But Sarah isn't the only person looking for Robin. As their paths intersect, something dangerous is set in motion, leading Robin and Sarah to fight for much more than their relationship...