I've come full circle with this series. 
 This book is a 3.5 stars for me, just like the first book. Extra 0.5 stars added because of the ending! I like open endings like that! If Michael had conclusively had died, and there was a funeral, I would've given this a 4. Would've packed in the emotional feels. OR...if Michael and Christina had an emotional reunion...I would've given this 5 :) 
 Hahaha. I'm kidding. 
 Michael had an excellent character arc in this novel. You see him really stripped bare and vulnerable. Christina too! She's a survivor. They both go through some horrendous shit - from a guy that is as one-dimensional can be. I get it. He's a raging psychopath. Michael is a great character. He's the best character, because he's so grey. Adrian is more one noted. In the previous books, the first in particular, I liked how he played mind games, by pretending to be Christina's 'saviour' and leading her to police HQ - that's all gone now. Where is the Adrian that liked seeing hope, encouraging it even, then crushing it with an iron fist? Now, he just makes empty promises to Suruya and Michael, which are empty indeed, but it doesn't cause the characters to feel an extreme of emotions....they're broken already.... 
 That said - what he does to Christina & Michael - not described graphically, but original. You don't see that everyday! 
 Overall, a good closure to the series - though a novella wouldn't hurt. 
 Locked & Loaded remains my favourite. 
 Then Armed & Dangerous. 
 Cloak & Dagger next. 
 And finally Cease & Desist :)