First, if you haven't read book one yet, what are you waiting for?
Go read it! Goooooo :D

Worldbuilding:
This is the second book of the series, set in the same world as the Demons of New Chicago series, so we know the world by now. We know the lay of the land and who the players are.
Scenes and environments were, as usual, clear and detailed. Very well written!

Character development:
With the way the first book ended... I admit I wasn't sure how it would get resolved. Nat has always been treated as inferior. I didn't want her to be second place for one of her lovers. And this was a big part of the story in this installment.
Nat has a lot on her plate, and her men don't make it easier for her. Lucifer still haunts her but starts feeling more real the closer they get to Samhain. August, has formed a bond with Nat but hasn't told her about it yet, and Marcel has so many secrets I don't even know where to start...
This installment has many twists and turns again, so hold on to your horses. You're in for a wild ride.

Pacing and flow:
This book felt a lot slower than the previous one. I think because there wasn't much about the investigation or the search for Katherine. But instead, the focus was on her relationship with each man or, well... demon... you know what I mean! It was only toward the end that things started speeding up.

The book:
The book is well-written with no (noticeable) errors. There are sexual scenes described (if that is important to you).
The book has 282 pages, spread over 22 chapters, and is told from multiple points of view.

Final thoughts:
I voluntarily read an advanced reader copy of this book, and while I thought it to be a good continuation of the series, I felt like I was missing a part of the plot... the dead people and the search for Katherine. That ending, though... why do you do this to us?? We need the last book of this series as soon as possible, please!