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Sunscreen SPF 50,000. We’ll get burned to a crisp.”
    “Medea’s what ?”
    Annabeth rummaged through her backpack and cursed. “I had a jar of tropical coconut scent sitting on my night-stand at home. Why didn’t I bring it?”
    I’d learned a long time ago not to question Annabeth too much. It just made me more confused. “Look, I don’t know what you’re talking about, but I’m not going to let Tyson get fried.”
    “Percy—”
    “Tyson, stay back.” I raised my sword. “I’m going in.”
    Tyson tried to protest, but I was already running up the hill toward Clarisse, who was yelling at her patrol, trying to get them into phalanx formation. It was a good idea. The few who were listening lined up shoulder-to-shoulder, locking their shields to form an ox-hide–and-bronze wall, their spears bristling over the top like porcupine quills.
    Unfortunately, Clarisse could only muster six campers. The other four were still running around with their helmets on fire. Annabeth ran toward them, trying to help. She taunted one of the bulls into chasing her, then turned invisible, completely confusing the monster. The other bull charged Clarisse’s line.
    I was halfway up the hill—not close enough to help. Clarisse hadn’t even seen me yet.
    The bull moved deadly fast for something so big. Its metal hide gleamed in the sun. It had fist-sized rubies for eyes, and horns of polished silver. When it opened its hinged mouth, a column of white-hot flame blasted out.
    “Hold the line!” Clarisse ordered her warriors.
    Whatever else you could say about Clarisse, she was brave. She was a big girl with cruel eyes like her father’s. She looked like she was born to wear Greek battle armor, but I didn’t see how even she could stand against that bull’s charge.
    Unfortunately, at that moment, the other bull lost interest in finding Annabeth. It turned, wheeling around behind Clarisse on her unprotected side.
    “Behind you!” I yelled. “Look out!”
    I shouldn’t have said anything, because all I did was startle her. Bull Number One crashed into her shield, and the phalanx broke. Clarisse went flying backward and landed in a smoldering patch of grass. The bull charged past her, but not before blasting the other heroes with its fiery breath. Their shields melted right off their arms. They dropped their weapons and ran as Bull Number Two closed in on Clarisse for the kill.
    I lunged forward and grabbed Clarisse by the straps of her armor. I dragged her out of the way just as Bull Number Two freight-trained past. I gave it a good swipe with Riptide and cut a huge gash in its flank, but the monster just creaked and groaned and kept on going.
    It hadn’t touched me, but I could feel the heat of its metal skin. Its body temperature could’ve microwaved a frozen burrito.
    “Let me go!” Clarisse pummeled my hand. “Percy, curse you!”
    I dropped her in a heap next to the pine tree and turned to face the bulls. We were on the inside slope of the hill now, the valley of Camp Half-Blood directly below us—the cabins, the training facilities, the Big House—all of it at risk if these bulls got past us.
    Annabeth shouted orders to the other heroes, telling them to spread out and keep the bulls distracted.
    Bull Number One ran a wide arc, making its way back toward me. As it passed the middle of the hill, where the invisible boundary line should’ve kept it out, it slowed down a little, as if it were struggling against a strong wind; but then it broke through and kept coming. Bull Number Two turned to face me, fire sputtering from the gash I’d cut in its side. I couldn’t tell if it felt any pain, but its ruby eyes seemed to glare at me like I’d just made things personal.
    I couldn’t fight both bulls at the same time. I’d have to take down Bull Number Two first, cut its head off before Bull Number One charged back into range. My arms already felt tired. I realized how long it had been since I’d worked out with