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Season of the Witch by Sarah Rees Brennan - The Literary Phoenix
Nope, nope, nope.Let's be honest here, media tie-ins are always a risk. First of all, most the time they make the assumption that you're already a big fan and that's why you're reading the book. I personally believe they'd be a more effective resource if the two could stand alone, and make you want to seek out the other.