#30 Pet by Catherine Chidgey

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Like every other girl in her class, twelve-year-old Justine is drawn to her glamorous, charismatic new teacher, and longs to be her pet. However, when a thief begins to target the school, Justine’s sense that something isn't quite right grows ever stronger. With each twist of the plot, this gripping story of deception and the corrosive power of guilt takes a yet darker turn. Young as she is, Justine must decide where her loyalties lie.

This story had a lot of potential that it didn't fulfill.