A compelling ride, and well-written. Often, the images of Kate Beckett and Richard Castle would come into my head as I read it. Everything was well-captured - Beckett's gut feeling, her professionalism, as well as how she might be annoyed by Castle. It was like being in the passenger seat the whole time. 
 It was an enthralling time who may have committed the murders and why, so for the part - definitely a page turner. 
 However, once the actual killer is revealed, I was not as convinced with the motive. Those who have read or will read, will know what I mean when they reach the final few pages. 
 Thus, a 4 on 5. I enjoyed it.