I wished Annabeth were here. She'd know what to make of my dream. I'd never admit it to her, but she was smarter than me, even if she was annoying sometimes.

I was about to close my notebook when Matt Sloan reached over and ripped the photo out of the rings.

"Hey!" I protested.

Sloan checked out the picture and his eyes got wide. "No way, Jackson. Who is that? She is not your—"

"Give it back!" My ears felt hot.

Sloan handed the photo to his ugly buddies, who snickered and started ripping it up to make spit wads. They were new kids who must've been visiting, because they were all wearing those stupid HI! MY NAME IS: tags from the admissions office. They must've had a weird sense of humor, too, because they'd all filled in strange names like: MARROW SUCKER, SKULL EATER, and JOE BOB. No human beings had names like that.

"These guys are moving here next year," Sloan bragged, like that was supposed to scare me. "I bet they can pay the tuition, too, unlike your retard friend."

"He's not retarded." I had to try really, really hard not to punch Sloan in the face.

"You're such a loser, Jackson. Good thing I'm gonna put you out of your misery next period."

His huge buddies chewed up my photo. I wanted to pulverize them, but I was under strict orders from Chiron never to take my anger out on regular mortals, no matter how obnoxious they were. I had to save my fighting for monsters.

Still, part of me thought, if Sloan only knew who I really was…

The bell rang.

As Tyson and I were leaving class, a girl's voice whispered, "Percy!"

I looked around the locker area, but nobody was paying me any attention. Like any girl at Meriwether would ever be caught dead calling my name.

Before I had time to consider whether or not I'd been imagining things, a crowd of kids rushed for the gym, carrying Tyson and me along with them. It was time for PE. Our coach had promised us a free-for-all dodgeball game, and Matt Sloan had promised to kill me.

The gym uniform at Meriwether is sky blue shorts and tie-dyed T-shirts. Fortunately, we did most of our athletic stuff inside, so we didn't have to jog through Tribeca looking like a bunch of boot-camp hippie children.

I changed as quickly as I could in the locker room because I didn't want to deal with Sloan. I was about to leave when Tyson called, "Percy?"

He hadn't changed yet. He was standing by the weight room door, clutching his gym clothes. "Will you… uh…"

"Oh. Yeah." I tried not to sound aggravated about it. "Yeah, sure, man."

Tyson ducked inside the weight room. I stood guard outside the door while he changed. I felt kind of awkward doing this, but he asked me to most days. I think it's because he's completely hairy and he's got weird scars on his back that I've never had the courage to ask him about.

Anyway, I'd learned the hard way that if people teased Tyson while he was dressing out, he'd get upset and start ripping the doors off lockers.

When we got into the gym, Coach Nunley was sitting at his little desk reading Sports Illustrated. Nunley was about a million years old, with bifocals and no teeth and a greasy wave of gray hair. He reminded me of the Oracle at Camp Half-Blood—which was a shriveled-up mummy—except Coach Nunley moved a lot less and he never billowed green smoke. Well, at least not that I'd observed.

Matt Sloan said, "Coach, can I be captain?"

"Eh?" Coach Nunley looked up from his magazine. "Yeah," he mumbled. "Mm-hmm."

Sloan grinned and took charge of the picking. He made me the other team's captain, but it didn't matter who I picked, because all the jocks and the popular kids moved over to Sloan's side. So did the big group of visitors.

On my side I had Tyson, Corey Bailer the computer geek, Raj Mandali the calculus whiz, and a half dozen other kids who always got harassed by Sloan and his gang. Normally I would've been okay with just Tyson—he was worth half a team all by himself—but the visitors on Sloan's team were almost as tall and strong-looking as Tyson, and there were six of them.

Matt Sloan spilled a cage full of balls in the middle of the gym.

"Scared," Tyson mumbled. "Smell funny."

I looked at him. "What smells funny?" Because I didn't figure he was talking about himself.

"Them." Tyson pointed at Sloan's new friends. "Smell funny."

The visitors were cracking their knuckles, eyeing us like it was slaughter time. I couldn't help wondering where they were from. Someplace where they fed kids raw meat and beat them with sticks.

Sloan blew the coach's whistle and the game began. Sloan's team ran for the center line. On my side, Raj Mandali yelled something in Urdu, probably "I have to go potty!" and ran for the exit. Corey Bailer tried to crawl behind the wall mat and hide. The rest of my team did their best to cower in fear and not look like targets.

"Tyson," I said. "Let's g—"

A ball slammed into my gut. I sat down hard in the middle of the gym floor. The other team exploded in laughter.

My eyesight was fuzzy. I felt like I'd just gotten the Heimlich maneuver from a gorilla. I couldn't believe anybody could throw that hard.

Tyson yelled, "Percy, duck!"

I rolled as another dodgeball whistled past my ear at the speed of sound.

Whooom!

It hit the wall mat, and Corey Bailer yelped.

"Hey!" I yelled at Sloan's team. "You could kill somebody!"

The visitor named Joe Bob grinned at me evilly. Somehow, he looked a lot bigger now… even taller than Tyson. His biceps bulged beneath his T-shirt. "I hope so, Perseus Jackson! I hope so!"

The way he said my name sent a chill down my back. Nobody called me Perseus except those who knew my true identity. Friends… and enemies.

What had Tyson said? They smell funny.

Monsters.

All around Matt Sloan, the visitors were growing in size. They were no longer kids. They were eight-foot-tall giants with wild eyes, pointy teeth, and hairy arms tattooed with snakes and hula women and Valentine hearts.

Matt Sloan dropped his ball. "Whoa! You're not from Detroit! Who…"

The other kids on his team started screaming and backing toward the exit, but the giant named Marrow Sucker threw a ball with deadly accuracy. It streaked past Raj Mandali just as he was about to leave and hit the door, slamming it shut like magic. Raj and some of the other kids banged on it desperately but it wouldn't budge.

"Let them go!" I yelled at the giants.

The one called Joe Bob growled at me. He had a tattoo on his biceps that said: JB luvs Babycakes. "And lose our tasty morsels? No, Son of the Sea God. We Laistrygonians aren't just playing for your death. We want lunch!"

He waved his hand and a new batch of dodgeballs appeared on the center line—but these balls weren't made of red rubber. They were bronze, the size of cannon balls, perforated like wiffle balls with fire bubbling out the holes. They must've been searing hot, but the giants picked them up with their bare hands.

"Coach!" I yelled.

Nunley looked up sleepily, but if he saw anything abnormal about the dodgeball game, he didn't let on. That's the problem with mortals. A magical force called the Mist obscures the true appearance of monsters and gods from their vision, so mortals tend to see only what they can understand. Maybe the coach saw a few eighth graders pounding the younger kids like usual. Maybe the other kids saw Matt Sloan's thugs getting ready to toss Molotov cocktails around. (It wouldn't have been the first time.) At any rate, I was pretty sure nobody else realized we were dealing with genuine man-eating bloodthirsty monsters.

"Yeah. Mm-hmm," Coach muttered. "Play nice."

And he went back to his magazine.

The giant named Skull Eater threw his ball. I dove aside as the fiery bronze comet sailed past my shoulder.