Miss Petrie is first mentioned in The Long Walk, as the softhearted district spellmaster. We never learn her first name.
Jessie hears a voice in her head that she calls Miss Petrie, after her second grade teacher.
It was a voice apt to stubbornly insist that even the most obvious wrongs were actually rights, parts of a benign plan too large and complex for mere mortals to grasp. There would be times (mostly during her eleventh and twelfth years, when she called that voice Miss Petrie, after her secondgrade teacher) when she would actually raise her hands to her ears to try and blot out that quacking, reasonable voice — useless, of course, since it originated on the side of her ears she couldn't get to — but in that moment of dawning dismay while the eclipse darkened the skies over western Maine and reflected stars burned in the depths of Dark Score Lake, that moment when she realized (sort of) what the hand between her legs was up to, she heard only kindness and practicality, and she seized upon what the voice was saying with panicky relief.
- Chapter 18