“Margaret,” I say, slipping the drawing into my top drawer. “You’re here early.”

“I need to speak with you in my office,” she says, her voice echoing slightly in the empty hallway. “Before the students arrive. We have a serious situation.”

I already know what this is about. As I follow her down the corridor, I notice her hands are tightly clenched. She stops at her door, turning back to me with a look that makes my blood run cold.

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