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Mr. Brunner parked his wheelchair at the base of the handicapped ramp. He ate celery while he read a paperback novel. A red umbrella stuck up from the back of his chair, making it look like a motorized cafe table.

I was about to unwrap my sandwich when Nancy Bobofit appeared in front of me with her ugly friends—I guess shed gotten tired of stealing from the tourists—and dumped her half-eaten lunch in Grovers lap.

"Oops. " She grinned at me with her crooked teeth. Her freckles were orange, as if somebody had spray-painted her face with liquid Cheetos.

I tried to stay cool. The school counselor had told me a million times, "Count to ten, get control of your temper. " But I was so mad my mind went blank. A wave roared in my ears.

I dont remember touching her, but the next thing I knew, Nancy was sitting on her butt in the fountain, screaming, "Percy pushed me!"

Mrs. Dodds materialized next to us.

Some of the kids were whispering: "Did you see—"

"—the water—"

"—like it grabbed her—"

I didnt know what they were talking about. All I knew was that I was in trouble again.

As soon as Mrs. Dodds was sure poor little Nancy was okay, promising to get her a new shirt at the museum gift shop, etc. , etc. , Mrs. Dodds turned on me. There was a triumphant fire in her eyes, as if Id done something shed been waiting for all semester. "Now, honey—"

"I know," I grumbled. "A month erasing workbooks. "

That wasnt the right thing to say.

"Come with me," Mrs. Dodds said.

"Wait!" Grover yelped. "It was me. I pushed her. "

I stared at him, stunned. I couldnt believe he was trying to cover for me. Mrs. Dodds scared Grover to death.

She glared at him so hard his whiskery chin trembled.

"I dont think so, Mr. Underwood," she said.

"But—"

"You—will—stay—here. "

Grover looked at me desperately.

"Its okay, man," I told him. "Thanks for trying. "

"Honey," Mrs. Dodds barked at me. "Now. "

Nancy Bobofit smirked.

I gave her my deluxe Ill-kill-you-later stare. Then I turned to face Mrs. Dodds, but she wasnt there. She was standing at the museum entrance, way at the top of the steps, gesturing impatiently at me to come on.

Howd she get there so fast?

I have moments like that a lot, when my brain falls asleep or something, and the next thing I know Ive missed something, as if a puzzle piece fell out of the universe and left me staring at the blank place behind it. The school counselor told me this was part of the ADHD, my brain misinterpreting things.

I wasnt so sure.

I went after Mrs. Dodds.

Halfway up the steps, I glanced back at Grover. He was looking pale, cutting his eyes between me and Mr. Brunner, like he wanted Mr. Brunner to notice what was going on, but Mr. Brunner was absorbed in his novel.

I looked back up. Mrs. Dodds had disappeared again. She was now inside the building, at the end of the entrance hall.

Okay, I thought. Shes going to make me buy a new shirt for Nancy at the gift shop.

But apparently that wasnt the plan.

I followed her deeper into the museum. When I finally caught up to her, we were back in the Greek and Roman section.

Except for us, the gallery was empty.

Mrs. Dodds stood with her arms crossed in front of a big marble frieze of the Greek gods. She was making this weird noise in her throat, like growling.

Even without the noise, I wouldve been nervous. Its weird being alone with a teacher, especially Mrs. Dodds. Something about the way she looked at the frieze, as if she wanted to pulverize it. . .

"Youve been giving us problems, honey," she said.

I did the safe thing. I said, "Yes, maam. "

She tugged on the cuffs of her leather jacket. "Did you really think you would get away with it?"

The look in her eyes was beyond mad. It was evil.

Shes a teacher, I thought nervously. Its not like shes going to hurt me.

I said, "Ill—Ill try harder, maam. "

Thunder shook the building.

"We are not fools, Percy Jackson," Mrs. Dodds said. "It was only a matter of time before we found you out. Confess, and you will suffer less pain. "

I didnt know what she was talking about.

All I could think of was that the teachers mustve found the illegal stash of candy Id been selling out of my dorm room. Or maybe theyd realized I got my essay on Tom Sawyer from the Internet without ever reading the book and now they were going to take away my grade. Or worse, they were going to make me read the book.

"Well?" she demanded.

"Maam, I dont. . . "

"Your time is up," she hissed.

Then the weirdest thing happened. Her eyes began to glow like barbecue coals. Her fingers stretched, turning into talons. Her jacket melted into large, leathery wings. She wasnt human. She was a shriveled hag with bat wings and claws and a mouth full of yellow fangs, and she was about to slice me to ribbons.

Then things got even stranger.

Mr. Brunner, whod been out in front of the museum a minute before, wheeled his chair into the doorway of the gallery, holding a pen in his hand.

"What ho, Percy!" he shouted, and tossed the pen through the air.

Mrs. Dodds lunged at me.

With a yelp, I dodged and felt talons slash the air next to my ear. I snatched the ballpoint pen out of the air, but when it hit my hand, it wasnt a pen anymore. It was a sword—Mr. Brunners bronze sword, which he always used on tournament day.

Mrs. Dodds spun toward me with a murderous look in her eyes.

My knees were jelly. My hands were shaking so bad I almost dropped the sword.

She snarled, "Die, honey!"

And she flew straight at me.

Absolute terror ran through my body. I did the only thing that came naturally: I swung the sword.

The metal blade hit her shoulder and passed clean through her body as if she were made of water. Hisss!

Mrs. Dodds was a sand castle in a power fan. She exploded into yellow powder, vaporized on the spot, leaving nothing but the smell of sulfur and a dying screech and a chill of evil in the air, as if those two glowing red eyes were still watching me.

I was alone.

There was a ballpoint pen in my hand.

Mr. Brunner wasnt there. Nobody was there but me.

My hands were still trembling. My lunch mustve been contaminated with magic mushrooms or something.

Had I imagined the whole thing?

I went back outside.

It had started to rain.

Grover was sitting by the fountain, a museum map tented over his head. Nancy Bobofit was still standing there, soaked from her swim in the fountain, grumbling to her ugly friends. When she saw me, she said, "I hope Mrs. Kerr whipped your butt. "

I said, "Who?"

"Our teacher. Duh!"

I blinked. We had no teacher named Mrs. Kerr. I asked Nancy what she was talking about.

She just rolled her eyes and turned away.

I asked Grover where Mrs. Dodds was.

He said, "Who?"

But he paused first, and he wouldnt look at me, so I thought he was messing with me.

"Not funny, man," I told him. "This is serious. "

Thunder boomed overhead.

I saw Mr. Brunner sitting under his red umbrella, reading his book, as if hed never moved.

I went over to him.

He looked up, a little distracted. "Ah, that would be my pen. Please bring your own writing utensil in the future, Mr. Jackson. "

I handed Mr. Brunner his pen. I hadnt even realized I was still holding it.

"Sir," I said, "wheres Mrs. Dodds?"

He stared at me blankly. "Who?"

"The other chaperone. Mrs. Dodds. The pre-algebra teacher. "

He frowned and sat forward, looking mildly concerned. "Percy, there is no Mrs. Dodds on this trip. As far as I know, there has never been a Mrs. Dodds at YancyAcademy. Are you feeling all right?"

2. THREE OLD LADIES KNIT THE SOCKS OF DEATH

I was used to the occasional weird experience, but usually they were over quickly. This twenty-four/seven hallucination was more than I could handle. For the rest of the school year, the entire campus seemed to be playing some kind of trick on me. The students acted as if they were completely and totally convinced that Mrs. Kerr—a perky blond woman whom Id never seen in my life until she got on our bus at the end of the field trip—had been our pre-algebra teacher since Christmas.

Every so often I would spring a Mrs. Dodds reference on somebody, just to see if I could trip them up, but they would stare at me like I was psycho.

It got so I almost believed them—Mrs. Dodds had never existed.

Almost.

But Grover couldnt fool me. When I mentioned the name Dodds to him, he would hesitate, then claim she didnt exist. But I knew he was lying.

Something was going on. Something had happened at the museum.

I didnt have much time to think about it during the days, but at night, visions of Mrs. Dodds with talons and leathery wings would wake me up in a cold sweat.

The freak weather continued, which didnt help my mood. One night, a thunderstorm blew out the windows in my dorm room. A few days later, the biggest tornado ever spotted in the HudsonValley touched down only fifty miles from YancyAcademy. One of the current events we studied in social studies class was the unusual number of small planes that had gone down in sudden squalls in the Atlantic that year.

I started feeling cranky and irritable most of the time. My grades slipped from Ds to Fs. I got into more fights with Nancy Bobofit and her friends. I was sent out into the hallway in almost every class.

Finally, when our English teacher, Mr. Nicoll, asked me for the millionth time why I was too lazy to study for spelling tests, I snapped. I called him an old sot. I wasnt even sure what it meant, but it sounded good.

The headmaster sent my mom a letter the following week, making it official: I would not be invited back next year to YancyAcademy.

Fine, I told myself. Just fine.

I was homesick.

I wanted to be with my mom in our little apartment on the Upper East Side, even if I had to go to public school and put up with my obnoxious stepfather and his stupid poker parties.

And yet. . . there were things Id miss at Yancy. The view of the woods out my dorm window, the Hudson River in the distance, the smell of pine trees. Id miss Grover, whod been a good friend, even if he was a little strange. I worried how hed survive next year without me.

Id miss Latin class, too—Mr. Brunners crazy tournament days and his faith that I could do well.

As exam week got closer, Latin was the only test I studied for. I hadnt forgotten what Mr. Brunner had told me about this subject being life-and-death for me. I wasnt sure why, but Id started to believe him.

The evening before my final, I got so frustrated I threw the Cambridge Guide to Greek Mythology across my dorm room. Words had started swimming off the page, circling my head, the letters doing one-eighties as if they were riding skateboards. There was no way I was going to remember the difference between Chiron and Charon, or Polydictes and Polydeuces. And conjugating those Latin verbs? Forget it.

I paced the room, feeling like ants were crawling around inside my shirt.

I remembered Mr. Brunners serious expression, his thousand-year-old eyes. I will accept only the best from you, Percy Jackson.