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?
This book is part of the Sweet Valley Twins: Super Chillers Books series and is book #9 in the series.