I absolutely loved this sequel. It's a lot more fast paced compared to Ninth House and even more full of adventure and monsters. 
I love Bardugos atmospheric writing style and attention to detail. 
My favourite part of this book was learning the past of the 4 main characters during their descent into Hell, this for me was an interesting detail that added depth to the characters and the story overall. Showing us that everyone has their demons, even detective Turner. 

I was a little confused by the introduction of vampires and not entirely sure it was necessary for the story, but it made more sense later on down the line after Alex researched it and Dawes & Darlington give deeper explanations. 

I couldn't write this review without mentioning the sexual tension between Alex and Darlington and I'm sure I'm not the only person wondering if this will go anywhere in the next book? 
Overall I loved this book and am looking forward to reading more of Bardugos work.