This is really more of a 3.5 as opposed to a 3. Because of everything she did right, this book gets a 4.
Pros
1) Great Character Development (for the most part. More later on that.)
2 ) Fantastic pacing; some really gripping scenes
3) Good job with the flashbacks -- added tension to the story and explanation to behaviors
Cons
1) Details, like the Rottweiler sent to attack, and it paws the air. Attacking dogs attack, they don't paw the air. But, I saw later why she'd done it; it was necessary to the story, though. I wish she'd found a different way to leave something in the elevator.
2) The killer and motives weren't well enough developed. The red herrings were all too obvious, so were easily ruled out as the killer.
3) To avoid a spoiler, I can't give details. When the last May Queen is taken, the details after her capture seem completely opposite to how others might act around her. You find out later why, but you have to stick with it to find out. Hints are given, but I didn't realize that's what was going on, and a few passages I thought the writer was just being stupid. Once you get to the end, it all makes sense.
Overall, this was a very good read, and I would recommend it to those who like suspense. It did have a lot of British jargon, which I loved. Being an American, it's nice to get a touch of the authentic.
There were at couple of loose ends that I would like to have had tied up. Why did the fellow get kicked off the police force? Why was he deliberately drinking himself to death? Unrequited love was mentioned in passing, but that was all. This lent itself nicely to him maybe being the killer, but was never explained.
Another loose end was the budding romance that was left hanging. It would seem from the beginning of the book that this would be important, but it got no time at the end.
I read "Fry", which led me to this book. Fry was a more solid book, and it's one that I would reread. This one, however, maybe, maybe not. It was an easy read, and I might go back to see what clues I may have missed. Depends on what other books I have backed up waiting for attention.
I will continue to watch for more novels by this author, because for the most part they are well plotted and really good reads.