This series is so fun, so suspenseful, so full of teenage certainty and angst and foolhardy choices, and truly and deviously good, and The Hand on the Wall was the ending it deserved so magnificently. I can't even really tell you what I liked about it without giving away the plot, so you'll just have to read the whole thing to find out. Already looking forward to re-reading these as non-audiobooks just to have a different experience of them, but they are great narrated as well.