There are a few spoilers in this review, but it's probably better than taking the time to read this book...and I can't even be sorry.
Giving this book a 2 instead of a 1 for casual inclusion of LGBTQ characters in positive relationships. Otherwise, this book was something else.
I'm shocked it's being published in 2020; this kind of book should have been left in 2012, when YA was still finding its feet.
Shadow is a young noblewoman (I think? It's implied that she has to go live at Court and eventually marry someone, but it's never clearly explained), but all she wants is to be a member of the Hearth-something Guild, which I believe is a network of spies/assassins working for the Queen of Renovia (again, I think? There were a lot of big names being tossed around, it was so hard to keep track of them). When Cal Holt (between this and "Shadow" the naming system of this book confused me) is arrested and poses as a prisoner after assassinating a traitor to the throne (given that Cal is the Queen's ASSASSIN, it was very confusing as to *why* he would be punished for doing his job, especially given that this is the only time throughout the book that he actually does his job), Shadow breaks him out of prison and poses as an apprentice sent by the queen.
So, Caledon and Shadow set out to the land of Montrice (the capital of which is called Mont for reasons I cannot comprehend) to...I honestly can't remember at this point. I think they were trying to uncover a secret plot against the crown? Maybe. Here's the first problem with this book: There are TOO many things going on. There are evil monks who want magic and also want to depose of Queen Lilliana and her family, but Queen Lilliana is actually of Dellefiora (or something, and I have no idea what that's supposed to mean to me); Shadow and Cal are assassins but they spend the entire book being "spies" (quotation marks included because all they do is attend parties and hunts and the "spying" activity consists of them breaking into one (1) office); Shadow has every power under the sun, I guess; Cal is also trying to retrieve from Scrolls that were taken from the queen he serves and she needs them back so desperately that she made his father swear a blood vow that he would retrieve them, but Cal's father died so the vow passed to him? Again, this book is trying too hard to being so many things and in the end it accomplishes none of its goals.
Readers are expected to believe that Shadow is the Coolest because she is Different from other girls, and this means that she is apparently a very skilled fighter, spy, and mage, and also she isn't aware that she's beautiful and all of the boys want to dance with her. There was a time and a place for this kind of character, and I think it's safe to say we're all grateful that we left this Mary Sue trope behind for the most part. Unfortunately, this book seeks to bring that trope back. It goes a step further by declaring that Shadow is *actually* Crown Princess Lilac in addition to being a martial artist/mage/spy. It all comes across as extremely manipulative of the reader, given that Shadow spends the entire novel knowing that she's the princess, and while there are supposedly "clues," they're so quick to be brushed over that they get lost amongst the millions of plotlines that appear once before being dropped (shapeshifters, evil monks, scrolls, spying, there are witches suddenly, magic is gone but some people still have it, etc.). The twist seemed to think it was much smarter than it actually is, and I didn't see it coming from a mile away because Shadow's only redeeming feature was that she wasn't royalty.
Additionally, there was absolutely no personality for me to get attached to, nor did there appear to be any character development beyond her new love/attraction for Cal. The title implies that there would be some assassinations occurring throughout the novel, therefore opening the door to Shadow's struggle with morality, but the title is incredibly misleading because neither the Queen's Assassin NOR his apprentice actually do any assassinating.
The same can be said for Cal; I had absolutely no reason to care about him. In fact, I began to hate him, not only because of the use of third person present for his POV (I've never seen it in a book before, and I hope to never see it again, it was completely jarring), but also because of his consistent (disgusting) internal commentary about women's bodies, and how much he dislikes women (but not their bodies) unless they're Shadow, whom he frequently alludes to wanting to impregnate. He waxes poetic about Shadow (mostly her physical features, mind you), but is disgusted by the advances of the duchess, even though he reciprocates her flirtation. Both he and Shadow frequently refer to the duchess as "dumb" or "stupid," yet they spend perhaps half the book in her home.
I have NO idea why they were there in the first place, or what they were attempting to uncover, only that they eventually deduced that the duke was evil. We received a quickie explanation as to how this fits into the novel's beginning, with Cal murdering the traitorous crown prince, but not only is it an info dump that fails to clear up the 42852389 questions I still had, it doesn't explain why we spent so much of the novel being dragged through chapters and chapters of absolutely no plot. That's maybe my main gripe with the novel. The pacing is so incredibly off; mass reveals take up approximately 2 lines, but you could skip about 70 pages at a time and all you would've missed is Shadow and Cal pining for each other and lacking any semblance of communication skills, therefore sending them into the predictable (and horrible) pit of YA angst that most authors are trying to distance themselves from, on account that it's a complete snore-fest and actually insulting to teenagers (who, arguably, never know what they're doing at any given time).
The book also suffered from the perplexing addition of the laziest form of plot and world-building: journal entries from however long ago. The only time I've ever seen journal entries actually work in a manner that isn't contrived and lazy is in Claire Legrand's FURYBORN, as they're short snippets that allow for a greater understanding of the culture and tone of the world. TQA, however, plopped journal entries into the book as an introduction and, later, explanation of events that never fully connected with the plot at hand (although I never really knew what that was in the first place).
Another gripe I have: this book is fantasy romance. There is little substance beyond the romance, and even that is dry as plaster. But I am shocked by the aspect of familial romance. Cal and Shadow show up in Mont and pretend to be siblings (which is a very, very strange cover to assume when it's been clear since I read the synopsis that they're attracted to each other). This leads to a lot of awkward moments in which the court beholds a romantic moment between what they presume to be siblings, which Cal and Shadow laugh off at all times. Does it not make them uncomfortable that everyone *thinks* they're siblings, and they're acting like horny kids whose parents aren't home? The only saving grace is that Cal and Shadow aren't actually related--or so I thought. At the end of the book, Shadow/Lilac drops this piece of information: "My aunt Mesha is your mother's younger sister." ???! Do I...do I need to even comment on this? This is a completely unnecessary addition to this book, and it only makes the "romance" between Cal and Shadow more cringey. (But it gets better). At the end of the book, Lilac aka Shadow finds herself engaged to a king, but she tells Cal that he could be her consort. This is a man who, supposedly, wants nothing more than to be free of nobility and to have a family of his own. Shadow is supposed to know this because she knows him because, mind you, they're in love. Cal leaves, because he's too good to be a queen's consort, he speaks with a person who is supposed to be dead (no, we don't get an explanation about how they've come back), who informs Cal that the Big Baddy actually isn't dead. Cal and this character leave to seemingly hunt the Big Baddy.
We flash forward a few months, and Lilac is moping around her castle, having married the king (but never actually consummated the marriage, which again confuses me - the king was described as being very attracted to Lilac? Would he not want to consummate the marriage? To be consensual, would he not want to at least attempt to woo his wife? Do they not understand that as monarchs they ARE expected to have heirs for the sake of their country?), when she hears a knock on the door that was supposed to belong to her consort. It is undeniably Cal, given Lilac's reaction and her declaration that this room is to be known as "The Queen's Secret." Which begs a million more questions, all of which go unanswered. If this is supposed to be a duology, I'm confused, because even though we're left with 6436783867845 questions, the end seems very much like a cold, hard conclusion????
Ultimately, no, I will not be recommending this book to anyone