Evil Echo, Library by Dahl, Michael; Nickel, Scott; Crowther, Jeff (ILT), ISBN 1434219771, ISBN-13 9781434219770, Like New Used, Free shipping in the US

Echo, a shapeshifter, steals Halo Nightly's magic candy to become her evil twin and keep her from being friends with Cody Phinn, until Halo turns herself into the Ice Princess.