This was a fun read, with a very fast-paced plot and exciting characters. I enjoyed the conclusion; however there were still some things about this that frustrated me--mainly, (view spoiler)[NO ANSWERS ABOUT KELL'S AND LILA'S PASTS. I mean, seriously, the book is over 600 pages, and the one scene where Kell comes close to learning the truth about his parents, he decides it's not important and throws the chance away. This really just felt like the author didn't have an answer so she decided not to make it a thing. But, it became a thing already in the first book, so it felt lazy and rude to me as the reader. I mean, I still want to know, and I feel cheated. 
 There were so many scenes from secondary characters that could've been left out (without affecting the plot) and more background and development given to our main characters. Rhy and Holland got the most development--and those scenes were wonderful! There was a moment where Lila spoke to Holland about how many people they'd killed, and he knows the number but she doesn't, and I thought it was going to lead to some character development for her, but then nothing came of it. It was quickly forgotten, and that was frustrating. 
 Also, I wish more was done with the other Londons. I was hoping to learn more about Black London, but it was ignored the whole book. (hide spoiler)] 
 Despite those complaints, I did enjoy reading this one. I like the author's writing style a lot.