Petra: Calder's friend and main character. She also dislikes Tommy throughout most of the book. (Aubrey)
“"What?" Petra squawked. "Pansies! I'm reading it right now! The Invisible Man, I mean."”
Petra: A teacher at the school that thinks the students are gong to kill her.
Petra: One of the main characters. She is smart and a friend of Calder's.
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