Detective Cassie Maddox is still trying to deal with the events of In the Woods. She is out of the Murder Squad and has started a relationship with fellow detective Sam O'Neill but is too badly shaken to commit to Sam or to her career. Then Sam is allocated a new case, that of a young woman stabbed to death just outside Dublin. He calls Cassie to the murder scene and she finds the victim is strangely familiar. In fact, she is Cassie's double. Not only that, but her ID says she is Lexie Madison the identity Cassie used, years ago, as an undercover detective. With no leads, no suspects and no clues, Cassie's old undercover boss spots the opportunity of a lifetime: to send Cassie undercover in the dead girl's place. She could pick up information the police would never hear and tempt the killer to finish the job. So Cassie moves into Whitethorn House, poses as a post-grad student, and prepares to enter Lexie's world.
I don't really know how to describe this other than to say it was a tangible, breathtaking experience. You read it and the world grows up around you until you forget it's not actually happening to you. You feel every single thing that happens with your whole heart.
