I really enjoyed this book. It is well written and a real page turner. The book deals with a family grieving for their daughter and their move into an ultra modern computer controlled house. It becomes clear that someone is watching the family and doesn't have good intentions for them. There is a massive, shocking twist somewhere in the middle that I just didn't see coming. The story builds up really well and becomes really scary as things come to a head. As a parent it really makes you think how you would act if put in that situation with your child being at risk. The only criticism I have is that it all got really exciting but then suddenly wrapped up and ended. I wanted a little bit more. Particularly I wanted to know what Catriona's motivation was. A great read though and one to make you think!