This was actually a lot better than I had anticipated. I know I'm only giving it 3 stars, but it's more like 3.5 and I'm really waffling between that and 4. Anyway... 
 I found the pace to be a bit slow. It took quite a while for me to get into this one. It never really "grabbed" me. I started reading Heart of Steel in the middle of this one and was switching back and forth and really, I would've expected this one to suck me in to a point where I couldn't stop. But it never did. 
 I guess a lot of people didn't like the more open ending, but I thought it was resolved just enough. I really enjoyed the ending. It cleared up a lot, but left a lot out so we could imagine how things turn out. Well done. 
 Of course, I am the only Julian fan around. I didn't really care for him as much in this one though. I still didn't care for Alex either. Really, I think Lena and Hana had the strongest connection and would've been the best off together. Alas, it wasn't meant to be ;P.