3.5 stars. I went into this thinking it was YA and have since discovered it's actually classed as adult fantasy. I think in reality it's probably a good crossover from one to the other - the protagonist is 19, so the older end of YA - there's more complicated worldbuilding and moral grayness than a lot of YA fantasy (though I can think of YA example with both of those things as well), but the plot has a lot of familiar elements and themes a YA reader will feel comfortable with. 
 I really enjoyed the setting, a mix of Victoriana and futuristic elements with a seedy, gritty feel to it that portrayed the main character, Paige, and her life very well. Paige was strong and resourceful, with a confidence in herself and her abilities and a fierce vein of anger and injustice which fuelled her throughout the story. The side characters, at least the human ones, were intriguing and complex. But while the Rephaim certainly had a sense of otherness and being able to understand them too clearly would have lost that, they did often feel a bit of a stretch too far for suspension of disbelief - like pantomime monsters, at times, particularly (if I can say this without getting spoilery) the way they treated the humans in their city - it seemed counterproductive, evil for the sake of evil. 
 There was a lot of info-dumping in the first few chapters which really stalled my ability to get invested in the plot. Partly it's a result of the complicated magic system - I'm sure it could have been simplified, or at least the broad shape of it fed to us with details coming where they were needed. After that things got interesting, with danger and intrigue and betrayal or the prospect of I on every side, and I was keen to see how it played out. I think the romance was unnecessary, and didn't fit with the story or the characters - not that I can't see them together but the way it happened. Maybe rushed would be a better word - it could work but needed a lot more development. The later books in the series might flesh it out a bit more, I suppose. Overall, it did feel very much like the first book in a series.