When Rowan stumbles across the advert, it seems like too good an opportunity to miss: a live-in nanny position, with a staggeringly generous salary. And when she arrives at Heatherbrae House, she is smitten by the luxurious `smart' home fitted out with all modern conveniences, by the beautiful Scottish Highlands, and by this picture-perfect family. What she doesn't know is that she's stepping into a nightmare - one that will end with a child dead and her in a cell awaiting trial for murder. She knows she's made mistakes. But she's not guilty - at least not of murder. Which means someone else is.