I love this series. This is my third read through of the series and I appreciate it more each time. For me, this book really upped the ante on the quality of the books. The storyline was very solid and well paced. Everything came together very well. 
 In this book we see all of the characters growing, and we learn a lot about them, especially Kate and Curran. We see Kate accept her friendships / relationships regardless of what she had been taught by Voron and Greg throughout her childhood. She's ready to die for the people she cares about in order for them to live. She's very selfless in this book. She really always has been as a character, not really thinking about herself, but here we really get to see to what extent she will go. 
 We finally learn the story of Kate's background. It's been hinted at since book 1 and it wasn't really too hard to figure out what the secret was, but we actually get confirmation the Kate is indeed Roland's daughter. We, the readers know, but most everyone in the story is still unaware of Kate's background. I think by this point she's built it up so much in her head she believes that the people she loves will not understand, but they will. 
 We really get to see Kate and Curran's relationship keep growing. What started out as an irritable working realtionship, to interest. I don't know if I would call it love yet (we will wait for the next book to do that!) but they are definitely on their way. Their interactions in this book were some of the best scenes. They play off each other very nicely. I like their protectiveness of each other. They both want to keep the other safe from harm. It's sweet. I am interested to see how their relationship will continue to progress throughout the series. I think that Ilona Andrews has made very smart choices in how it has been represented so far and I have every faith that it will continue to be a strong, growing, loving relationship. 
 I Midnight Games scenes are great. They are intense and kept me quickly reading to get through it. The action writing in this book is so nicely detailed it's easy to picture the movements in your head as you read instead of just a jumble of words. The fight scenes are some of the best scenes in the book as well. 
 Overall this book really put it's characters through a ringer. They all started one way and were changed by the end I think setting up for the major story arc that is sure to come in the next few books. I can't wait.