It was a unique book that centres around the possibility that the dead are archived into a library where you can read their lives. The Histories (as they are called) are not truly alive but impressions of the people they were when they were alive. Only things in the archives are being shaken up and Mackenzie is determined to figure things out whilst she deals with the death of her younger brother Ben. 
 I knew little going into this book apart from the fact the dead were archived but within the first few pages I was dragged into a wild ride full of mystery and suspense. There are questions I would like answered but for all I know that will come later in the series. I want to know why the dead are archived, why there is a need for the archive in the first place when it's hidden from society. These questions weren't answered in this book, unless I missed something but they could be answered in the next book. 
 If your looking for a suspense filled book full of mystery then this is your book. Your left wanting for more when the story comes to an end.