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"I don't know, Waldo," Ben said. "The whole school is under quarantine.

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Plus, we're just kids. So how can we solve the mystery at Monster Academy?"

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"I don't know yet," Waldo admitted.

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"But what if it was my potion that caused the fog during the dance?"

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His glasses slipped down his nose, and he pushed them back up.

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"Maybe the fog from the lab traveled through the air vents to the gymnasium."

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"Could be," Ben murmured, remembering the fog inside the lab.

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"So you realize what this means, right?" said Waldo.

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"The epidemic is all my fault!"

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"It's not your fault, Waldo," Ben replied.

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"If the flu was caused by the fog from the lab, then it's someone else's fault—the monster who ruined your experiment."

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Waldo nodded, looking a little relieved. "Maybe you're right.

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But sometime soon Mr. Freaky or the nurse will trace the flu back to the lab.

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And then I'm in big trouble."

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"Well, maybe we can try to find out who tampered with your experiment," said Ben.

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"We could find the guilty monster and make him or her confess."

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"That's what I was thinking too," said Waldo.

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"First we have to figure out what we know—all the facts.

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Then we can use those facts to figure out who our culprit is.

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We know that there was fog in the lab."

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"Another fact is that someone removed the hoses from your test tubes," Ben added.

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"And we also know that purple fog filled the gym during the dance."

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"Good," said Waldo.

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"Here are some more things we know: both my potion and the fog were purple.

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And now everybody in Monster Academy is purple."

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"And nobody was sick before the dance," added Ben.

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Suddenly Waldo's eyes lit up. "Actually, that's not true!

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Miss Bungle has been sick since before the dance—before my potion caused that fog."

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"You're right," said Ben thoughtfully. "I forgot about that.

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Hey! Maybe your potion didn't cause this epidemic at all!"

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Just then they heard voices.

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They looked over the railing and saw Mr. Freaky at the bottom of the stairs.

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The principal was with a tall human in a white coverall.

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The man was wearing a mask and carrying a clipboard.

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"That man must be the health inspector from People Place," Ben whispered.

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"So you have no idea how this epidemic started?" the health inspector said to Mr. Freaky.

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"No," said Mr. Freaky, wringing his hands.

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"But trust me—I will find out what caused it.

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Mayor Hubbletree has nothing to worry about.

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Everything in Monster Academy is totally under control."

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The health inspector sounded doubtful.

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"It doesn't appear that things are totally under control here.

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Everybody is purple. Nobody in People Place is purple.

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Now, <font color="#ffff00"><i>that's</i></font> a place where things are totally under control."

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Mr. Freaky took out his handkerchief and blew his noses.

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"When did the epidemic start?" asked the health inspector.

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"Who was the first person, er, monster to get sick?"

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Mr. Freaky put away the handkerchief. "The first monster? Hmm, let's see . . .

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That would be Miss Bungle, our broom-flying instructor."

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Ben and Waldo looked at each other and smiled proudly.

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The two of them had just remembered this fact.

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"And where is she?" asked the health inspector.

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"She's at home," said Mr. Freaky.

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The health inspector made a note on his clipboard.

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"Show me the cafeteria.

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A lot of health problems occur where food is prepared.

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I want to see what you monsters are cooking."

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"Of course," said Mr. Freaky. "Follow me."

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Waldo looked at Ben and grinned. "Whew!"

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"I don't think you have anything to worry about, Waldo," said Ben.

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"The health inspector will figure out what caused the epidemic, and then someone will find a cure." Ben sighed.

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"<font color="#ffff00"><i>I</i></font> still have a problem though. Winnie's still mad at me."

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"I'll help you explain things to her," Waldo offered.

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"Come on, let's go find her right now."

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Ben and Waldo went downstairs to look for Winnie.

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As they passed through the lobby, a door opened, and in walked Miss Bungle!

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The ogre who worked in the main office rushed into the lobby.

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"Miss Bungle! You can't enter the building!

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Monster Academy is under quarantine!"

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The broom-flying teacher halted.

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She looked quizzically at the office ogre, and then at Ben and Waldo.

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"Why are you all . . . purple?"

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"There's an epidemic. And a quarantine!" the ogre repeated.

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"You have to leave at once!"

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Waldo stared at Miss Bungle. "Wait a second," he murmured.

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"Why are you surprised that we're all purple?

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You've been sick with the flu all week. Didn't you turn purple too?"

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Miss Bungle shook her head.

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"No, I just had a minor case of monster flu—you know, sore throat, achy joints, and small green spots."