I was so excited to read this book for several reasons, one being that I love Marie Lu. The cover is beautiful and the summary sounded promising. I read an excerpt and was immediately hooked. The world is described in detail and I was drawn in by the events and characters. Speaking of characters, I really enjoyed all four of the main characters. They were well-written and each had their own distinct personality and arc. The writing flowed well and the worldbuilding was described with good details. The only things that really bothered me about the story (and the reason that I cannot give it a solid 5 stars) are more related to the fact that the story is written to a young adult audience and therefore included things that just weren't believable to me. Otherwise, this was a great story and I would recommend it to anyone who previously enjoyed Marie Lu's books or YA fantasy in general.