I've heard this novel is like a Harry Potter/P&P mash-up, but since I've never read HP and never will, that part is of no consequence to me. I do hope that HP is more complex in magic and architecture descriptions than this book was, because this is why it's only 4.5 stars, rounded to 5.
Sometimes I had no clue what rooms were where in the book, and that's sad, because the author's job is to set the scene so the reader doesn't have to stop and scratch their head and read back to see if they missed anything, never mind that scene-setting is a lovely tool to get the reader "feeling" the story. This was a big faux pas.
As for the magic, it was wards, wards, wards. Although there was a war taking place, the magic didn't even seem nearly as dangerous as the title implies, as the whole concept seemed pretty straightforward to me, a neophyte in reading books with magic in them. There were places where I was confused as to who was doing what, and clarification came later, though.
I won't go through the book and point out every detail. The summary and spoiler approach is not my style of review. Instead, I'll comment on general technical proficiency.
This book must have had an editor, because for the most part the editing was good. But there were some big misses. For example, "dust moats," and pouring for poring, and the maid whose name was Emily then Amy. Non-Regency words or words misused in the Regency sense included trousseau, "taken aback," outing, staff, and the American roiling. This is a low number of words for a JAFF. The author used filter words and -ly adverbs with said, telling where she should have been showing. She also used some head-hopping. 19 contractions were found by this reviewer. That's not too many, but they were mostly from the mouths of higher-classed characters. Austen rarely used contractions for other than less refined characters, e.g., Lydia and Mrs. Bennet.
When I shelved this book, I almost shelved it under "no sex, no violence," but it has its fair share of violence, and the author could have done better to have empathy for the victims. In one case, she made him into a fool for his weakness. I suppose when this is war, there should be no weakness, but it's a fine line to tread.
I found no plot holes, but those more familiar with the magic may have done. The twist with the ring was cleverly accomplished. Characterizations were consistent and well-drawn. Some were non-canon, and that was okay since it was well justified in this novel. The development of the romance was believable and consistent and worked well throughout the time-line.
The cover is excellent, both for its ability to catch the eye of the reader among other covers and to convey a sense of what's inside. The colour choices are especially striking, as they seem to work well with the sense of impending danger that the author wishes to portray.
The book is the first of a series, yet it's totally a stand-alone novel. This is important to me, since I think any book that doesn't have a fully completed plot line within its covers and expects the reader to pay for the next book to get the ending is a cash grab. This book promises a new story after this one while giving the reader a complete story arc with HEA and satisfying ending.
To sum up, as a new reader to paranormal Regency romance, this book fit the bill quite well, and would have been better if a clearer sense of place and more interesting magic had been part of its excellent story. Otherwise, it's technically well-written, as it should be, since the author is not only well-experienced, but highly regarded and award winning. It had elements of fun and excitement that kept me engaged throughout the read. I'd recommend it to any JAFF reader.
Disclaimer: I am a JAFF writer and some might consider this review to be a conflict of interest. However, I was a reader first, and my reviews are honest and impartial. I write them for the benefit of both the reader and the author.