I am currently reading my way through a long list of science fiction and fantasy titles. (http://www.npr.org/2011/08/07/138938145/science-fiction-and-fantasy-finalists if you are interested in the list).
Well, it's a toss-up between this and another Tana French book, The Likeness.
Needless to say, I hope to read the next Dublin Murder Squad book, Broken Harbour, in the fairly near future.
I also plan to start searching the used book store to find copies of her novels--these are definitely "must own" books for me.