The Faceless Ones is the third book in the Skulduggery Pleasant Series.
It took me awhile to finally read this. I'm blaming a mixture of Midterms and the fact that I just read the Lunar Chronicles.
I really enjoyed this book. All your favorite characters are back (ALL of them) and we even get some annoying new people (Yay).
Oh, and this one does not have the same happy ending as the others...