Well, it was a good series, but I'm glad to have reached the end. 
 Full review can also be found on: Paein and Ms4Tune's Book Blog 
 Please note: some of this review will touch upon the whole series and some spoilers may be included. 
 I really don't get this title. The others all fit in with the story, there WAS a girl in a steel corset, there WAS a girl in a clockwork collar and there definitely was a girl with an iron touch. So who's the girl with the wind up heart?! 
 Unfortunately Griffin wasn't in this one much. Well, he was, but he wasn't with the group. He was lost and alone and stuck somewhere else. And a little bit of an idiot of the truth be known. I was happy for Jack (and I enjoyed finding out his truth!) and sorry poor Jasper didn't have much of a role in this one. 
 I'm really happy to have reached the end. I did enjoy my time with these characters but I do feel these are more teen books, the storyline, while twisty, is basic and the characters fall in love rather easily. They're all young and hold high skills, situations are resolved somewhat quickly and little attention is paid to the customs of the time. 
 SPOILER: Much mention is made of reputations and how quickly someone can be dropped from society and yet, not one single one of them have mentioned marriage within their neat little couples. Not only would this be proper but it would also keep them all safe. I feel as though it was something purposefully unaddressed and truthfully I thought far less of Griffin and Sam for it. (Not Jack so much as he hasn't had the same length of time, but he also goes one about reputation and the like) While it may not be something we agree with, it was the custom and expectation at the time this story is set and it's absence is not only noticeable, but an error in judgement I feel. 
 Most noticeably within this book, it seemed that things were added as the story went along, as though back story was hastily added to give substance rather than having spent the time lingering within the background in a sinister manner. We suddenly had flashbacks which were certainly a good cover, and yet not quite enough to disguise it. (I feel bad because I've already said all the nice things and all that's left are the less nice ones.) 
 I certainly enjoyed my time with these books and I'm glad I chose now to read them.