Good (murder mysteries/cop procedurals are still not my cup of tea), but not as good as In The Woods. I think it's because In The Woods had an eerie/supernatural undercurrent to it because of Ryan's missing friends. This seemed, from the description, to have the same sense of something-isn't-right that keeps the reader off balance, but Tana French squashed that in the beginning. The rest, while still good, didn't have that off-putting charge to it and was just a police story.
Still, will probably read her next book, Faithful Place.