The Titan's Curse

Nereus gloated. With a pop, he turned into a goldfish and did a backflip into the sea.
    “You tricked me!” I yelled.
    “Wait.” Thalia’s eyes widened. “What is that ?”
    “MOOOOOOOO!”
    I looked down, and there was my friend the cow serpent, swimming next to the dock. She nudged my shoe and gave me the sad brown eyes.
    “Ah, Bessie,” I said. “Not now.”
    “Mooo!”
    Grover gasped. “He says his name isn’t Bessie.”
    “You can understand her . . . er, him?”
    Grover nodded. “It’s a very old form of animal speech. But he says his name is the Ophiotaurus.”
    “The Ophi-what?”
    “It means serpent bull in Greek,” Thalia said. “But what’s it doing here?”
    “Moooooooo!”
    “He says Percy is his protector,” Grover announced.
    “And he’s running from the bad people. He says they are close.”
    I was wondering how you got all that out of a single moooooo .
    “Wait,” Zoë said, looking at me. “You know this cow?”
    I was feeling impatient, but I told them the story.
    Thalia shook her head in disbelief. “And you just forgot to mention this before?”
    “Well . . . yeah.” It seemed silly, now that she said it, but things had been happening so fast. Bessie, the Ophiotaurus, seemed like a minor detail.
    “I am a fool,” Zoë said suddenly. “I know this story!”
    “What story?”
    “From the War of the Titans,” she said. “My . . . my father told me this tale, thousands of years ago. This is the beast we are looking for.”
    “Bessie?” I looked down at the bull serpent. “But . . . he’s too cute. He couldn’t destroy the world.”
    “That is how we were wrong,” Zoë said. “We’ve been anticipating a huge dangerous monster, but the Ophiotaurus does not bring down the gods that way. He must be sacrificed.”
    “MMMM,” Bessie lowed.
    “I don’t think he likes the S-word,” Grover said.
    I patted Bessie on the head, trying to calm him down. He let me scratch his ear, but he was trembling.
    “How could anyone hurt him?” I said. “He’s harmless.”
    Zoë nodded. “But there is power in killing innocence. Terrible power. The Fates ordained a prophecy eons ago, when this creature was born. They said that whoever killed the Ophiotaurus and sacrificed its entrails to fire would have the power to destroy the gods.”
    “MMMMMM!”
    “Um,” Grover said. “Maybe we could avoid talking about entrails , too.”
    Thalia stared at the cow serpent with wonder. “The power to destroy the gods . . . how? I mean, what would happen?”
    “No one knows,” Zoë said. “The first time, during the Titan war, the Ophiotaurus was in fact slain by a giant ally of the Titans, but thy father, Zeus, sent an eagle to snatch the entrails away before they could be tossed into the fire. It was a close call. Now, after three thousand years, the Ophiotaurus is reborn.”
    Thalia sat down on the dock. She stretched out her hand. Bessie went right to her. Thalia placed her hand on his head. Bessie shivered.
    Thalia’s expression bothered me. She almost looked . . . hungry.
    “We have to protect him,” I told her. “If Luke gets hold of him—”
    “Luke wouldn’t hesitate,” Thalia muttered. “The power to overthrow Olympus. That’s . . . that’s huge.”
    “Yes, it is, my dear,” said a man’s voice in a heavy French accent. “And it is a power you shall unleash.”
    The Ophiotaurus made a whimpering sound and submerged.
    I looked up. We’d been so busy talking, we’d allowed ourselves to be ambushed.
    Standing behind us, his two-color eyes gleaming wickedly, was Dr. Thorn, the manticore himself.
    “This is just pairrr-fect,” the manticore gloated.
    He was wearing a ratty black trench coat over his Westover Hall uniform, which was torn and stained. His military haircut had grown out spiky and greasy. He hadn’t shaved recently, so his face was covered in silver stubble. Basically he didn’t look much better than the guys down at the soup kitchen.
    “Long ago, the gods banished me to Persia,” the manticore said. “I was forced to scrounge for food on the edges of the world, hiding in forests, devouring insignificant human farmers for my meals. I never got to fight any great heroes. I was not feared and admired in the old stories! But now that will change. The Titans shall honor me, and I shall feast on the flesh of half-bloods!”
    On either side of him stood two armed security guys, some of the mortal mercenaries I’d seen in D.C. Two more