December 2016 Re-read: This book is, by far, my favorite book in the series. I devour this book every time I pick it up. I laugh, I cry, I feel every moment. 
 Original Review: 
 I didn't have words enough to write a proper review of this the first couple of times I read it. And I'm not sure it's going to be much better this time. The problem that I'm having is that I refuse to spoil who the heroes are. No one knew prior to cracking open the book and diving in - did we have our suspicions? Heck yeah, and I was happy that I was right - but I think the joy of each reader discovering that for themselves is something beautiful. 
 I'll do my best though. With everything fresh in my mind, I think I can manage something other a bit more specific than my previous thoughts. 
 For eleven books now we've been watching as the battle for the very lives of the Psy in the PsyNet was fought - in shadows and secret, against humans and changelings and even the Psy themselves - this war was touching everyone, every group, on the planet. 
 It all comes to a head in Heart of Obsidian. 
 Nalini Singh skillfully brings us to the main resolution of the overriding story-arc that's driven each story in the books (including this one). There's still story to be told - have no fear - but this is the climax. Everything comes to a head, loyalties are tested, results are gathered, moves are made and nothing will ever be the same. 
 I've always loved Nalini's ability to build such an intricate and real world that I'm invested in it completely. How they're all tangled up together and actions taken by one can affect so many. There's no isolated group that's not affected, but a whole - depending on the careful and fair balance of the world that is their own as well. 
 The main characters are amazing - probably my favorites of all time. My heart broke for them many times - as expected - but was also filled to bursting as they came closer together, healing each other and themselves of hurts that were previously thought to go too deep. 
 We get a lot of little glimpses of other characters that we fell in love with in previous books, but even saying much more than that will be a hint as to whose story this is. 
 If you love the Psy-Changeling world, you're going to read this and you're going to (likely) be as excited as I was for it...and you're going to love it. 
 If you haven't read the Psy-Changeling series - why not? Give it a try, it's well worth it. 
 I guess this isn't much better than my previous review. I may as well end it the same: Nalini Singh's best novel yet. My favorite book in the series. Period. No contestation. I loved every minute. Easily in my Top 10 favorite books of all-time. 
 26 March 2014: UK: PS2.99 on Kindle (Amazon UK Daily Deal - Today Only!!!) 
 I can't bring together enough words to really do a review justice just yet. 
 But I will say that this is Nalini Singh's best novel yet. It's my favorite book. I loved every minute.