This is an amazing introduction to a new series. The world building was fantastic and the history was very rich - something that I love in a series. There is a nice twist of real life incidents and organizations that have morphed into something new and different (and a bit scary). Scarlet is about to discover just what they are capable of.
Along the way she has to come to terms with the reality that she is changing. Not just her world view and personality, but her physical self as she becomes Nightfall. There were a lot of surprises along this journey and I loved that I never really knew what was going to happen next.
*This book was received in exchange for an honest review*