Three years ago, Ethan and Nikki Rhodes suffered a devastating loss. Their four-year-old daughter Grace was tragically killed when she ran from their garden into the path of a car. Ethan, a radio personality, escapes into work, while Nikki quits her job to care for their remaining child, Grace's twin sister, Bella, who hasn't spoken since that night.

Trying to give the family a fresh start, Ethan moves them to a revolutionary house designed by the world-famous architect, Catriona Fisher. For the Rhodes', this is a life-changing move because a key feature of the house is the state of the art security system that allows them to be completely safe from the outside world within their own home.

But what if what they fear most is actually inside the house? What if 17 Church Row isn't the safe haven that they think it is?