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Hidden - P.C. Cast (House of Night Series, Book 10)
Product Description

Neferet's true nature has been revealed to the Vampyre High Council, so Zoey and the gang might finally get some help in defending themselves and their beloved school against a gathering evil that grows stronger every day. And they'll need it, because Neferet's not going down without a fight. "Chaos reigns at the House of Night."