Evil Elizabeth (Sweet Valley Twins)

Everyone thinks of Elizabeth Wakefield as the  nice twin. That's why she loves her Halloween  mask it's so scary that no one can believe Elizabeth is  behind it. But her appearance isn't the only think  that changes when she puts on the mask little by  little it makes Elizabeth act evil...only Elizabeth  doesn't know it. Can her twin sister Jessica  destroy the mask before Elizabeth does something she'll  regret forever?