Not for me I am afraid; I just don't get on with horror and Gothic atmosphere. I thought it might be manageable in a YA book, but it's just all drawn out descriptions of nastiness and not much action. The first character we meet, we spend far too much time with for someone unrelatable. A paragraph would have sufficed to indicate menace, then we should switch to the protagonists, the main relatable characters.
I had not read the previous book; if I had, I might have been interested in the young people and their activities, but alas, I wasn't. Those who did read and enjoy the first in the series will doubtless like the story.
I can recommend instead, Stone Heart by Charlie Fletcher, for an alternate London.
This is an unbiased review.