HEXBOUND by Chloe Neill

They say absolute power corrupts absolutely. But it turns out even a little bit of magic can turn you to the dark side. That's why Lily has to learn how to control her newly discovered abilities and quickly, on top of avoiding the snobs who think they run her school, nursing a crush on a cute sophomore with a big, werewolfy secret and fighting the good fight with her best friend Scout as they take on Chicago's nastiest nightlife - including the tainted magic users known as the Reapers.
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