I would start off by saying that the plot is a bit intriguing but the writing style is as though you're in too much of a haste to get this book over with. Cohesion is completely missing and that really left me confused many a times. Like, at the end of one of the chapters, Alder had gone home, however, at the beginning of the next chapter, she was in school.
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The grammar, though good, can be improved. Like there are some places where there should be a punctuation mark and there is none and at times, one isn't needed but you've put a comma. Even sentence case is messy at certain points.
The plot is promising, but the way it is presented makes it eccentric. I'm sure if you try working on it, you'll find this story doing better. :)