The gist is - parallel universe Victorian England, but where some of the aristocrats are also mages. You have to be either rich or connected to learn magic, even if you are extremely gifted. Magic is taught at "Atheneums", every magical discipline has its own Atheneum. Training outside of an Atheneum is highly illegal. Spells are represented by runes and can either have a long standing area effect (e.g lock spell on a door) or an immediate explosive one (e.g shooting lightning at someone). The heroine Elsie is a Spellbreaker - essentially the opposite of a mage, she can dismantle any spell. Spellbreakers don't have to have formal training to hone their art, and Elsie is illegal since she is unregistered by the authorities. She can't learn to cast spells, just break them. She is also a radical socialist, working for a shadowy organization claiming that her work helps the downtrodden lower class.
There are several reasons I didn't like even what I skimmed:
1. Mary Sue heroine
2. Gratuitous descriptions of Victorian England. The writer seemed hellbent on showing us only the fun, upbeat parts of it. Corsets! Romantic serials published weekly! "Chatelaine bag"! (will someone for the love of god tell me what that is? I'm scared)
3. Gratuitous use of vague setting - I realize that historical fiction/fantasy could just be a playful distraction from daily life. However, this novel weaponizes vagueness. It's made clear that magic is not a secret part of this world, but a central basis of its power structures - the whole anemic class struggle (more on that later) is more or less based on this assumption. But there's no background on how the world is affected by magic and its existence. I'd be sort-of fine with that if this novel was an "all-whiter" (my own pun there). But the male hero is from Barbados, and is depicted as a person of color, yet no mention is made of ANY trans-Atlantic matters whatsoever. Is he the child of a slave? Is there slavery in this universe? Barbados is name-dropped, a lot of polite giggling is made about the lovely weather there, and that's it. I repeat, the central male character is from there! Half the novel is from his POV! And yet we learn next to nothing about what kind of life a person of color would be expected to lead in this fictional universe. Even actual Victorian and pre-Victorian novels made references to the trans-Atlantic slave trade. It was considered a dirty subject back then, but not unmentionable. If the writer is too timid to tackle this, why make your male lead from Barbados at all? Or a POC?
4. Bland central conflict - Elsie the Mary Sue is depicted as hating the upper class and proud to do her part to be taking them down and fighting for the common man, but she mainly just talks about it and thinks it. Apart from unquestioningly committing crimes because an anonymous letter-sender tells her she would be accomplishing good in the world, she doesn't participate in any groups for the betterment of her community, doesn't give alms, and just... sort of hangs around doing god knows what and mooning around. Not to mention that with the exception of 2 snobs, most of the upper class representatives she interacts with are lovely to her. There are no examples of the downtrodden being trodden upon. No horrifying public executions of thieves, illegal mages, or illegal spellbreakers, making this class war look like it exists largely in Elsie's overwrought imagination.