The Immortal Crown is the second book in the Age of X series by Richelle Mead. It continues shortly after the first book, Gameboard of the Gods, left off. This is an ongoing series and it's important to read it in order. If you haven't read the first book yet, I urge you to do so prior to reading this one. 
 In this book we follow Justin and Mae as they join a diplomatic mission into Arcadia, RUNA's hostile and deeply religious neighbor. In addition to the official mission, Mae has a personal side mission to find and save her niece. I really enjoyed reading along as Mae and Justin navigate themselves in a Country so different from their own. In Arcadia woman are basically treated as slaves and chattel to the men. They have very few rights and the rights they do have depend on men. Mae and the other Praetorian woman masquerade as concubines to hide the fact that they are there as security. This consists of hiding their nature and acting meek and subservient, a role that is completely opposite of who they really are. 
 I found Justin to be much more likable in this book. He put others ahead of himself and stopped begin selfish. I liked him and I really like Mae. They are both unique and intriguing characters. They have chemistry and work well together. In The Immortal Crown the emotional ties between them deepen and Justin knows he must resist or he'll find himself bound in service to a God. Something he is determined to avoid. 
 The Immortal Crown has a parallel plot following Tessa as she interns for Daphne, a reporter. I have to say, I understand why this plot line was included, however I didn't find it interesting at all and I didn't like how it jumped back and forth from one plotline to another. I was aggravated every time I was pulled away from Justin and Mae because they were the storyline I wanted to read about. 
 Overall, I liked The Immortal Crown. It is an ongoing complex and layered story that is completely different from anything I have read before. It delves into religion and the Gods are numerous. They maneuver and cajole their chosen elects and work to gain their loyalty and service. There is action, danger and a bit of romance. The ending leaves the direction of the plot uncertain. I wasn't thrilled with it and some of actions that occurred. I'm leery of what might happen next. 
 The Immortal Crown is recommended to fans of the Age of X series. 
 *ARC (Advanced Review Copy) received from PENGUIN GROUP Dutton via NetGalley.