This got off to a good start. Even though there are oodles of novels about serial killers, the plot was developing tension and going along nicely. Then the author goes off on a tangent and brings in an unlikely secret Irish clan. At this point the book starts going downhill. Sticking with the main theme would have been better. There are other lesser flaws. Too many situations repeat themselves. There are other ways of building drama besides having characters cuss and bang their hands on the nearest available object. Detective Abbie Kearney, the protagonist, is always dashing off while her reasoning is difficult to fathom at times. The book is well-written and there’s a nice twist to the plot at the end, but overall there’s just too much in the story that doesn’t have to be there.