I recommend Archangel's Blade. 
 ***** 
 DECADENT. 
 Archangel's Blade is sinful; very, very sinful! This book is, by far, the strongest and the most solid story among the Guild Hunter series. Nalini Singh wrote Dmitri's character very consistently and i loved that. Even though I was irritated on how (or why) Honor and Dmitri connected, I can't deny that I really enjoyed the book. How i've missed these cruel angels and impossible vampires! 
 Honor and Dmitri both have painful, horrible pasts. Whereas Honor still finds compassion among the helpless, Dmitri has none. I can imagine Honor's struggle and determination to survive, as much as Dmitri's decision to kill his humanity through cruelty. They are both fighters, literally and emotionally. Though the general atmosphere of the plot is about dark, bloody vengeance, it was balanced by snippets of Ilium's (Yey!) and Raphael's humor. Venom is getting really interesting! I believe he's starting to grow on me. Jason is brooding - an air of sentimentality laced with pain - man, he's gonna be the bomb for the next book. Ms. Nalini Singh, about Bluebell's story?!! ;) 
 Archangel's Blade is a hard but rewarding read. Dmitri's world is lethal; Honor's is unforgiving. Reading it makes me think of a phoenix: in order to rise and have a new life, Dmitri and Honor must die and be grinded into dust until there's none left. I am still not a fan of Dmitri, but i think his story is more compelling and well-written than Rafael's.