I'm honestly not sure how this got published, although given the proclamation on the back page that the author is an internationally acclaimed writer I have to assume connections. It certainly isn't the merits of the book.
There are so many things that make this book infuriatingly difficult to read, and at nearly 450 pages it would take hours to properly list them all. However, it is consistently shoddy. It gives the impression of being cobbled together with very little thought, from plot points that go nowhere or reappear and disappear randomly, to several plot strands that are not only flawed but completely nonsensical even as they are presented, let alone when you think about them further. Any hints at providing some kind of background for the story or characters fails because every new point is contradicted by other pieces of the story or characters.
Why is there a coven of the most powerful witches that no-one knows about, except everyone knows about, and they are too powerful to be taken down except the only reason they aren't defeated by a handful of shoddy bad guys is one superwitch? Other covens are hinted at but don't seem to exist except the one that kind of does? Witches outside the completely unexplained Sentinel controlled areas are free and artifacts sold but they're not free and in hiding and attacked by rogue agents? Crystal witches have to work on their power but have innate power? Kitchen witches are mentioned a handful of times then ignored to the point I really struggle to understand why they were brought up at all? Legacies... Exist? Pentagram is easily accessed by anyone with any kind of net savvy and has been used to organise attacks but is impossible to access (unless you're one of the bad guys who are bad with technology) and has no widespread use that we see and is hardly mentioned? There was a whole maiden, mother, crone thing that seemed important and then went absolutely nowhere, which also made a whole portion of the book and a pretty major event utterly pointless. Even the format of the book starts off with interjections between chapters to flesh out the world (badly and largely pointlessly) and then these are apparently forgotten as it continues. The major twist of the book is scientifically inaccurate and makes no in world or out of world sense, although at this point that seems like a trivial complaint.
The prose itself is dire. While it is occasionally harmless enough to be quite entertaining (chuckles were had at the possible insinuation of a man pushing a car with his groin) it is frequently difficult to tell what's actually happening because the writing is so bad. In places there's endless repetition, sentences that lose all ability to be fluently read by the author's assumption no-one will understand what she's saying unless repeatedly hit over the head with it. This is also the first time I've truly understood the phrase "show don't tell" - I'm a fan of writing that tells you what's happening instead of being too focussed on action points, but this proves what the problem is. The writing consistently told us things from a characters perspective that they couldn't possibly know, whether because they couldn't actually see it or would need to read someone's mind - and this is in a book that introduces various kinds of magical links and mind reading and still doesn't make use of this in a way that makes sense. (I could write an entire review on the mind linking and how wildly inconsistent and stupid it is, but I won't, because life is too short. Safe to say it reads like the author thought it might be interesting, didn't think it through at all, and spent the whole book playing catch up wit the need to change the power every time a new plot point happened.) This also gets worse as increasingly each chapter starts in one place then tells us how they got there, so scenes jump backwards when it would have been much easier to just read an account of what happened. Even within scenes the perspective randomly switched between characters, in such a way it always felt jarring but was somehow also difficult to tell who you were with at any given time.
The characters themselves are, I think, awful, but it's hard to tell since they don't have much character to speak of. Most of them are complete stereotypes, only worse because they don't even make sense as stereotypes - see the cowboy, incessantly referred to as the cowboy, seemingly based on the fact he wears cowboy boots at one point, but is from California. The desperation of the author to typecast her characters leads to them being referred to by incredibly annoying and stupid nicknames, and also strips any potential depth - the tortured 19 year old is a teenager, and while wildly inconsistent when she is allowed a character it's whiny 14 year old. The professor is generic academic with whatever knowledge is conveniently needed, although largely unnecessary. Also he's super weedy, because all academics are so weak and feeble. There's a magical negro stereotype, who is introduced as looking like a Zulu warrior just in case the racism wasn't on the nose enough. There's a fiery, independent Latina woman with flowing hair and a temper who must learn to love but is definitely not a racist caricature. One of the Bad Men uses the word cuck almost every time we hear him speak just in case we didn't get the message about toxic misogyny. I cannot begin to explain the ham-fisted attempt at a romance story, except to say that straight people shouldn't be allowed to write sex scenes until they learn what foreplay is. Each character has a handful of memories/personality traits/family history points that are repeated, often word for word, so often throughout the book I began to wonder if the author assumed no-one would be able to get through it without skimming and missing most of the little character developments there was. Sadly I did not take this approach and therefore read all of these. It was not fun.
One star because despite some serious TERF vibes there was actually a trans character who was treated well, by cis "don't really understand gender but support trans people" standards. Frankly that was a nice surprise. It was the only one.