In short: I felt that Clockwork Princess by Cassandra Clare was the perfect ending to an amazing series and its beloved characters. 
 Overpowering happiness and emotional devastation - is it possible to feel such entirely different emotions over the ending of a series? Because with Clockwork Princess, the final book in one of my most favourite and beloved series, I sure felt that way. Clockwork Princess was a mixed bag of thrills and laughs, anguish and dread. I felt much the same about Clockwork Angel and Clockwork Prince, but Clockwork Princess kicks it up a notch definitely. I could not think of a more perfect outcome and ending for this amazing series and its beloved characters. 
 The same thing that I have always said about Cassandra Clare's characters holds true: they are some of the most engaging, endearing, and interesting characters I have come across. Every character, whether main or side, has their own unique personality and backstory and I have SUCH fondness for them all! Which makes it all the worse when they inevitably have to deal with ALL THE CRAP as Cassandra Clare systematically goes through each and every one of them and bestows drama and anguish and shite on them all. Cassandra Clare has proven time and time again that she has no problem playing with her readers' emotions and I suspect she in fact enjoys seeing us fall madly and deeply in love with her characters only to reduce us to puddles of despair and heartbreak by torturing them. Damn her! Works. Every. Time. 
 "How could three people who cared for one another so much cause one another so much pain?" -pg.175 
 One of the main sources of this heartbreak is of course the love triangle. But it is a love triangle that actually WORKS. I am still kind of in awe of Cassandra Clare's ability to craft a love triangle that does NOT make me want to cut somebody. But there it is: a TRUE love triangle in which everyone involved feels an equal amount of affection and respect for each other and in which no one comes out of the affair looking bad. Something of a rarity for love triangles. And I love that Cassandra Clare gave Will and Jem's bromance as much emphasis as she gave to the main romantic relationships. For the first time ever, I feel as though a love triangle has been handled effectively and gracefully. And I am so thankful of that. 
 I don't think Clockwork Princess was technically perfect; I had some minor, passing issues. But what do they matter when this finale affected me so profoundly and emotionally? I was very much saddened to have to say goodbye to this series and its cherished characters (though as we have come to expect from Cassandra Clare, this is not necessarily the case). I think Cassandra Clare came up with a practically perfect ending for The Infernal Devices that will hopefully satisfy the majority of readers - it did for me, anyways.