In the world described in this book, there are two types of magic: spark, which is the "legal" and "good" magic, and weave, which, in essence, is weaving the strands of the fabric that makes up the world. However, it is illegal due to its "bad" nature. When two girls, Revna and Linné are brought together by the government, they find that their government is getting desperate to win a war and will cross lines it needs to do so. 

I really liked the cover. Specifically, the font choice is excellent, and I really liked how the bird in the background (is that a phoenix?) has its feathers...