I want to preface this by saying I am not criticizing the call to action. I fully understand this book as a work of activism, not purely a novel. I honestly was overlooking many of the plot issues for the majority of this book because I was bought in and I was enjoying it, easily a solid 4 stars until the end. That's where the issues persisted and became too big to ignore. I would love to read more books like this and see them on store shelves. However, I do think that they should be good books and not leave the fact that they're a narrative novel on the back burner. 

All of my issues can be summed up with this: Mira does nothing. She is inactive in the story. 
The story is set in her first-person POV.

Mira has no arc in this book. She never comes into her magical powers, she doesn't start as someone opposed to Aspen's climate activism and slowly learn that her sister was right, she doesn't even find her sister herself in the end (another character does it for her! and if she's never been taken for a ride by the supporting cast, it never would have happened). This makes this entire book one big info dump, which makes the pacing very odd. Things happen in a quick timeframe, but we spend 10ish consecutive pages learning about all of the different magical powers these teens have. Even with that, I don't have a very clear picture of the magic system other than some strings of facts. I don't know how it interacts, as we only ever see it affecting Mira or as something she witnesses happening.

Mira explains everything about her sister's disappearance to us in the first chapter, which is forgivable as this is a debut book. But then we start to get into the secret order, and everything is told to Mira again. In order to break it up a bit, the supporting cast will drug her or make her sleep before she gets another big info dump. and so on and so forth. This is a rare occasion where I am advocating for another 100 pages. This way, there will be the time needed for Mira to become an active character and slowly figure these things out for herself.

Like I said, I was enjoying the book. The writing is decent. I was happy to be along for the ride until all the twists at the end. I was not invested in them emotionally. They come up out of seemingly nowhere and are TOLD to Mira (and thus us, the audience) by other supporting characters. Mira's one big motivator is finding her sister, and she does not even do that. The secret society finds her as a consequence of her existing, it seems. She doesn't seek them out or stumble upon them accidentally. Or do anything, even after they find her. For a supposed activist, she is very passive. 

The book is also very on the nose about everything, telling the reader what to think about stuff instead of showing why it's bad. I'm not disagreeing with any of the stances taken in this book, but the delivery won't be convincing to people who are already skeptical.

I do think the author has a lot of potential to be a great writer if she focuses on improving her narrative skills. I've seen similar issues (though not usually to this extent) in traditionally published works and seen improvement in later books as the authors get better and writing and find their narrative voice. I think once Nosek nails that, she'll be dropping banger after banger.