Leo said. Six hours of dusting down, Chad and Leo were back in Leo’s lab with Roger. “Evil Principal V really is evil.” “Like, make-zombie-slaves-to-dust-your-miniature-unicorns evil?” Chad asked. “Exactly,” Leo said. “And I think he’s using this plant to do it.” Leo held out the sample of the bright green plant he’d taken from Principal V’s office. “It’s obviously some kind of cold-climate plant,” Leo said. “Notice the fine silky hairs on the leaves. That’s to trap heat. I know this plant,” Leo said. “I’ve read about it. But I don’t remember where or why.” “If you’ve read about it, it definitely has something to do with zombies,” Chad said. “As in, it probably turns people into zombies.” “That’s what I figured,” Leo said. “But I can’t find any record of it. Plus,” he added after a pause, “I took a bite of it.” “You what?” Chad said. “Many great scientists have been forced to use themselves as subjects,” Leo said.