Its hard to make comparisons with other similar stories. The concept of a London where there is the human side and then the hidden supernatural side isn't new but this book does feel different. And in a good way.
The Oversight, the law (lore) enforcement intermediaries between both worlds are well written well rounded characters and you feel for them as they start to see their world come under attack from their enemies.
There is also a nicely hinted back story that gives things a lot more depth.
Its also has a nice brand in humour that helps with the overall tenseness of the story..you are never quite sure how safe the main characters are , and they certainly don't get things all their own way.
The good news for me is that, within the overall trilogy arc, there is a good self contained element to this first book so some major peieces are resolved by the books end but with some tantalising story thresd still dangling.
Not seen much publicity for this book which is a shame, it deserves more recognition.