As seen on Ed and Em's Reviews!So, I was really hoping that there would be a blog tour for Shift, the second book in the Firstborn series by Raine Thomas. After reading the first book, Defy back in May for a previous blog tour, I was almost desperate to read the next book! Lucky me, right? As soon as I got an email from YA Bound Tours, I signed up! This series has completely captured my interest and I've found it to be unforgettable!Shift is all about Sophia and Quincy - romance wise. Honestly, the romance is not the only part of this novel that really keeps your interest. (It's shocking that I've actually said this, I know. I'm quite surprised, too!) The conflict, minor characters, a prose will hook you from the very beginning. You'll have no choice but to follow Quincy and Sophia's story in utter fascination. The best part of that is that you won't have a problem, either! It's addicting!I adore these characters! Especially the cameo of the couple that Defy revolved around, Tate and Zachariah. Tate is hilarious and awesome! Just reading her first appearance in this novel made me remember why I loved book one so much! She's witty and light-hearted with a flare for being rebellious. And Zachariah has that sexy alpha male thing going on. He and Tate are great for each other. My favorite character in this novel though, is definitely Quincy. He's such a sweetheart and has the best intentions at heart. Plus, he love for Sophia makes me sigh happily. Sophia got on my nerves some times. She has a tendency to overreact and not fully thinking things through. So basically, she's your everyday teenage girl. What I loved most about these characters is that none of them seemed forced or fake, each one had a role in the story and they carried it out perfectly. Plus, they all mesh together very well!The plot line is as intriguing in this book as it was in the book before it. I couldn't help but be sucked in until the very end. There is so much to grasp that you really have to read carefully to make sure you caught all the information! I seriously enjoyed it and found myself, for the most part, unable to put it down because the conflicts and adventure had me on the edge of my seat. It should be noted that I did have to stop a few times to do some laundry and cook dinner, it was not of my own free will.I would honestly recommend reading the prequel series before starting Defy and Shift. The world that Ms. Thomas beings to life can hard to keep up with if you don't learn everything about it with the original characters. It's a great series, so definitely get a copies of the previous books. I can't wait to see what the author gives us in the next book! I'm sure it will be a phenomenal addition to a great series!I received a free e-copy of this novel for a blog tour in exchange for my honest review.