I read this as a follow up to to S.J. Bolton’s Now You See Me.    I really, really liked this book.  Exciting and suspenseful, unputdownable (and yes I know that is not a word).  The character of Lacey Flint is engaging and a real underdog  hero that you root for all the way.  Her complicated non-relationship with DI Mark Joesbury is fresh and fraught with its own tension and suspense.  Although you can read this as a standalone, to really have an understanding of Lacey and Joesbury I would recommend reading the first book.

The mystery is creepy and down right scary at times.  The combination of old fashioned scares combined with stalking and modern technology works really well.  The twists and turns have you doubting the characters and their perceptions even as they doubt themselves.  Evi is a perfect rendition of a therapist dealing with her own physical and emotional issues torn by her concern for the victims and her professional code of ethics.   The Cambridge setting is fascinating and the fact that it should be such a “safe” place adds weight to the horrifying events.

Great thriller mystery.  I have already checked a couple more of S.J. Bolton’s books out from the library.  Highly recommended read.