As a huge fan of psychological thrillers and Facebook this book appealed to me immediately and I started it almost as soon as I was approved on Netgalley. Louise is a divorced, single mum who receives a friend request from someone she thought she'd left behind in her past over 25 years old. The fact that the friend request is from a girl who died and Louise has carried the guilt and secrets with since, only increases her paranoia and fear. Told through Louise's point of view and switching from past and present, this story has many layers and underlying themes including bullying and trying to fit in and being accepted at school. I raced through this book and was constantly trying to guess who/why/where and how. This is a gripping page turner and I thoroughly enjoyed it. My thanks to Netgalley and the publishers, Little, Brown Book Group UK