Where do I even start? Fantastic! Really. I am trying to figure out how to write this review without giving anything away, but still letting you know how awesome of a book it is. I was pulled in from the very beginning. The story just flowed so well and kept me intrigued the whole time. The character developement was wonderful. I enjoyed getting to know all of them. I love how Alex is so strong mentally and physically. She is one of those kick-ass female characters you absolutely love. She is sarcastic, and reckless at times. She is very strong-willed, and like a typical teenager makes mistakes and has trouble knowing when to keep her mouth shut, but is very smart and determined. There is no way she is going to let herself be thrown into a life of servitude. She knows that being a Sentinel is what she is meant to do. Alex struggles with training to get back into the covenant, the sadness of losing her mother, why the Apollyon (a half-blood that can control all the elements and is the ultimate daimon killer) is there instead of out fighting daimons, and the feelings she has about Aiden. She knows it's wrong to even think about, but she can't help it. The romance that developes between Alex and Aiden is very believable. It's not one of those instantly in love things. I enjoyed the dialogue between them, the silly banter, and the nice sweet conversations. The Apollyon has been brought to the covenant because of something to do with Alex and when they find out why, they are even more confused at the reasons behind it. This book is packed with action, mythology (with a twist), some romance, a lot of sarcasm and humor, plot twists, and there's some tear-jerkers for you too. I couldn't helped but be completely into this book. There is never a dull moment. The next book in this series titled Pure comes out in the spring and I can't wait to see where the story is going! Also there is a prequel titled Daimon that I highly recommend you read before jumping into this.