Free Percy Jackson and the Olympians: the lightning thief by Rick Riordan

Chiron said. "I don't suppose you do. I think a size five will do. I'll visit the armory later."
    I wanted to ask what kind of summer camp had an armory, but there was too much else to think about, so the tour continued. We saw the archery range, the canoeing lake, the stables (which Chiron didn't seem to like very much), the javelin range, the sing-along amphitheater, and the arena where Chiron said they held sword and spear fights.
    "Sword and spear fights?" I asked.
    "Cabin challenges and all that," he explained. "Not lethal. Usually. Oh, yes, and there's the mess hall."
    Chiron pointed to an outdoor pavilion framed in white Grecian columns on a hill overlooking the sea. There were a dozen stone picnic tables. No roof. No walls.
    "What do you do when it rains?" I asked.
    Chiron looked at me as if I'd gone a little weird. "We still have to eat, don't we?" I decided to drop the subject.
    Finally, he showed me the cabins. There were twelve of them, nestled in the woods by the lake. They were arranged in a U, with two at the base and five in a row on either side. And they were without doubt the most bizarre collection of buildings I'd ever seen. Except for the fact that each had a large brass number above the door (odds on the left side, evens on the right), they looked absolutely nothing alike. Number nine had smokestacks, like a tiny factory. Number four had tomato vines on the walls and a roof made out of real grass. Seven seemed to be made of solid gold, which gleamed so much in the sunlight it was almost impossible to look at. They all faced a commons area about the size of a soccer field, dotted with Greek statues, fountains, flower beds, and a couple of basketball hoops (which were more my speed). In the center of the field was a huge stone-lined firepit. Even though it was a warm afternoon, the hearth smoldered. A girl about nine years old was tending the flames, poking the coals with a stick.
    The pair of cabins at the head of the field, numbers one and two, looked like his-and-hers mausoleums, big white marble boxes with heavy columns in front. Cabin one was the biggest and bulkiest of the twelve. Its polished bronze doors shimmered like a hologram, so that from different angles lightning bolts seemed to streak across them. Cabin two was more graceful somehow, with slimmer columns garlanded with pomegranates and flowers. The walls were carved with images of peacocks.
    "Zeus and Hera?" I guessed.
    "Correct," Chiron said.
    "Their cabins look empty."
    "Several of the cabins are. That's true. No one ever stays in one or two." Okay. So each cabin had a different god, like a mascot. Twelve cabins for the twelve Olympians. But why would some be empty?
    I stopped in front of the first cabin on the left, cabin three.
    It wasn't high and mighty like cabin one, but long and low and solid. The outer walls were of rough gray stone studded with pieces of seashell and coral, as if the slabs had been hewn straight from the bottom of the ocean floor. I peeked inside the open doorway and Chiron said, "Oh, I wouldn't do that!"
    Before he could pull me back, I caught the salty scent of the interior, like the wind on the shore at Montauk. The interior walls glowed like abalone. There were six empty bunk beds with silk sheets turned down. But there was no sign anyone had ever slept there. The place felt so sad and lonely, I was glad when Chiron put his hand on my shoulder and said, "Come along, Percy." Most of the other cabins were crowded with campers.
    Number five was bright red—a real nasty paint job, as if the color had been splashed on with buckets and fists. The roof was lined with barbed wire. A stuffed wild boar's head hung over the doorway, and its eyes seemed to follow me. Inside I could see a bunch of mean-looking kids, both girls and boys, arm wrestling and arguing with each other while rock music blared. The loudest was a girl maybe thirteen or fourteen. She wore a size XXXL CAMP HALF-BLOOD Tshirt under a camouflage jacket.