The dangers of Christmas book shopping: I went out going to pick books for kids and ended up with titles I wanted to check out myself.
I ended up not getting this for any child, and it was a good call; it was too long and the plot a bit muddled for kids who are not seriously into books. But it was a lot of fun for adults who like reading children's adventure stories (and with glorious illustrations). Particularly the first chapters, the verve with the language, the names, the eccentric everything, a couple of twists already, glorious. It even made me compare it mentally already to favorites like the Penderwick books and Frances Hardinge's writing...
But it does not quite live up to the standards of the first chapters throughout (except the illustrations, which remain glorious throughout): the verve with language is less there, fewer puns. And I think objectively the book is too long, the murder plots too contrived (and too many gory murders for children's books) while at the same time the personality of the sisters clashing and looking after one another and their relationship with their caretakers and their absent parents is not enough there. (Felicity, for example, needed more on-page justice to her character, and IMO she deserved some payback over the moth trick...). It all felt unbalanced somehow. And too long for middle grade, I keep hitting that note (I think it is long in order to drop red herrings and many clues for a surprise denouement).
It did not make its mind if it wanted to have magic-supernatural being real or not. Its main message is ostensibly about people being able to define themselves by choice and not the names assigned to them but then it has the names being right unnaturally so (except once for surprise, and that is never explained) and magic talking to the dead machine. I am fine with either type of story, no magic or magic, but I want the rules followed throughout, underlying it all, rather than just having nice speeches which are contradicted by the all setup of the universe. Pick one!
Something worth pointing out is that this book is very, for lack of a better word and with no negative connotations intended, "woke," progressive in a certain definition, very liberal in a certain modern definition, and super focused on being didactic about gender identity issues. (Very Twitter, pre Elon at least. I wonder if this will feel dated in a few years. And my feeling is, ah bless the author, her (I checked pronouns) is in the right place, but I still rolled my eyes at stuff that seemed forced to be intentionally didactic and virtue signaling. Like the Marco!Polo! game gets diversified with the addition of Amelia Earheart and Olaudah Equiano which I cannot help feeling have names with many more syllables and not as fun and sonorous to scream out loud. The sidekick is a nonbinary kid, and we are told of their nonbinaryness right from the start because apparently it is really important (in English, where you do not need to put gender in verbs or adjectives) to make sure at once if a kid is a boy or a girl to the point of asking them straight out (it seems rude to me; what if they consider their gender identity to be unquestionably reflected in their appearance? Mind you, in Portuguese, sooner or later they will need to use an adjective or verb matching their gender, and that is solved). And a nice speech from a trans character about how "when I was born, everybody thought I was a boy. The doctors said I was a boy. My parents bought me boys’ clothes. I had to learn to talk in order to explain the situation to them, and they were terribly embarrassed by their mistake" and I am sorry I just can't take this seriously: the newborn baby being aware, before they could speak of what boys and girls are and the clothes it is being put in (baby clothes are usually just baby clothes!), it implies all kinds of underlying metaphysical (soul related for sure, consciousness related, and gender as some kind of fixed absolute concrete thing) stuff which just made me think of that Terry Pratchett saying, the problem with keeping an open mind is that people will insist on coming along and trying to put things in it. (And 99% of it will be junk: spam or ads). Maybe I was just cranky while reading it because my mind was quite busy feeling sorry for itself while my body was fighting a cold.
I am not rating the book considering these didactic intentions, since that seems intentional (very very very intentional!) and likely precisely what many readers want and might mean a lot to them. I am rating it based on everything else - first chapters are 5 stars, good dénouement, but too long and need more focus/depth to the 3 sisters and their family.