Kell makes his entrance since the first page of the book and the reader enter in his world without any kind of hesitation. He's the first guide of the four Londons and Schwab shows this world composed onto levels and dimension, making the reader a bit dazzled at the start, or confused, or maybe even fascinated, but doesn't offer so many explanations. 
 Be sure that I'm such a terrible and acid reader, because I need details. Always. And I needed them in that case too. 
 We have four Londons and every London has a color a type of magic. Or not-magic. But how these Londons were created? How they broke their passages and how they sealed the doomed Black London? I needed more. A lot more. As much as I needed some particulars over magic. 
 It was vague on the most important point, while Schwab works a lot on little details like languages and festivities, that surely enrich the world building and works well with the story's dynamics. 
 Also the concept of a living magic is fascinating, but... I hope that Schwab is going to explain more in A Gathering of Shadows. 
 I'm some kind of bad bookworm who always have big protest against the most loved books of the community, and ADSOM isn't an exception. 
 Where I've almost nothing to say about the plot - which seems okay and the introduction of something much more bigger - the characters didn't interested as much as I was looking for. 
 I was waiting for Kell, Lila and Rhy to swept me of my feet. Result? Nope. 
 Maybe I didn't see Rhy on the pages as much as I would have love to, while Kell and Lila - well, Kell left me with nothing. I followed him through his story but I cared for him? Another nope. 
 Lila, for as much as people love her, isn't my favorite at all. I like some parts of her but other bothered me. Lila is supposed to be smart - before reading the book, all the people I met told me how much she's amazing - but when she faces magic the first time, I felt like her brain stopped computing. Yes, magic has power on people but the dangerous effect of it aren't even started when Lila and Kell met each other, and so magic. 
 Yet I enjoyed the story and I'm pretty sure that I will experiment again the "second book is better", something that happen to me quite often. I have hard times with falling in love with the characters. 
 A little note also should be written about the villains. And I will say just that for who have already read this novel: are you kidding me? That's all? 
 I hope not. And I feel not.