I always hate writing bad reviews, so I want to keep this review on the shorter side. This book just fell flat for me. The concept was fantastic and original, society has been split into Dark and Night dwellers. Unfortunately, the whole thing just fell apart. There was literally no backstory, except for the what was in the summary on the cover. I was confused at why a pandemic would cause society to make such a split, and this is never actually explained. The brief explanations of the world that are given, and they are extremely brief mind you, are overall improbable and it requires a stretch of the imagination. There is so much that isn't explained, that the reader is left lost. While the writing wasn't terrible, it was actually quite good, I felt that with all of the plot holes, nothing could draw me in so that I would enjoy this story. 
 The plot is very shaky, and I was bored with the story by 150 pages in. I don't like stopping a book, or even skipping ahead, but I actually skipped about 100 pages, and still knew what was going on in the story. I could predict what was going to happen with the characters, and the plot, which I also think contributed to my boredom while reading. The characters were not very likeable to me either. 
 Overall, I just couldn't get into this story. The idea was great, but just wasn't executed properly. I think if this book was given a bit more time and finesse, it would have been amazing, and easily a hit. Ultimately, I would recommend skipping this one, and moving on to the next book on your list.