The Last Olympian

shut my eyes and concentrated. Grover.
    I knew he was somewhere in the park. Why couldn’t I sense his emotions? All I got was a faint hum in the base of my skull.
    Grover , I thought more insistently.
    Hmm-hmmmm , something said.
    An image came into my head. I saw a giant elm tree deep in the woods, well off the main paths. Gnarled roots laced the ground, making a kind of bed. Lying in it with his arms crossed and his eyes closed was a satyr. At first I couldn’t be sure it was Grover. He was covered in twigs and leaves, like he’d been sleeping there a long time. The roots seemed to be shaping themselves around him, slowly pulling him into the earth.
    Grover , I said. Wake up .
    Unnnh—zzzzz.
    Dude, you’re covered in dirt. Wake up!
    Sleepy , his mind murmured.
    FOOD , I suggested. PANCAKES!
    His eyes shot open. A blur of thoughts filled my head like he was suddenly on fast-forward. The image shattered, and I almost fell over.
    “What happened?” Nico asked.
    “I got through. He’s . . . yeah. He’s on his way.”
    A minute later, the tree next to us shivered. Grover fell out of the branches, right on his head.
    “Grover!” I yelled.
    “Woof!” Mrs. O’Leary looked up, probably wondering if we were going to play fetch with the satyr.
    “Blah-haa-haa!” Grover bleated.
    “You okay, man?”
    “Oh, I’m fine.” He rubbed his head. His horns had grown so much they poked an inch above his curly hair. “I was at the other end of the park. The dryads had this great idea of passing me through the trees to get me here. They don’t understand height very well.”
    He grinned and got to his feet—well, his hooves , actually. Since last summer, Grover had stopped trying to disguise himself as human. He never wore a cap or fake feet anymore. He didn’t even wear jeans, since he had furry goat legs from the waist down. His T-shirt had a picture from that book Where the Wild Things Are . It was covered with dirt and tree sap. His goatee looked fuller, almost manly (or goatly?), and he was as tall as me now.
    “Good to see you, G-man,” I said. “You remember Nico.”
    Grover nodded at Nico, then he gave me a big hug. He smelled like fresh-mown lawns.
    “Perrrrcy!” he bleated. “I missed you! I miss camp. They don’t serve very good enchiladas in the wilderness.”
    “I was worried,” I said. “Where’ve you been the last two months?”
    “The last two—” Grover’s smile faded. “The last two months ? What are you talking about?”
    “We haven’t heard from you,” I said. “Juniper’s worried. We sent Iris-messages, but—”
    “Hold on.” He looked up at the stars like he was trying to calculate his position. “What month is this?”
    “August.”
    The color drained from his face. “That’s impossible. It’s June. I just lay down to take a nap and . . .” He grabbed my arms. “I remember now! He knocked me out. Percy, we have to stop him!”
    “Whoa,” I said. “Slow down. Tell me what happened.”
    He took a deep breath. “I was . . . I was walking in the woods up by Harlem Meer. And I felt this tremble in the ground, like something powerful was near.”
    “You can sense stuff like that?” Nico asked.
    Grover nodded. “Since Pan’s death, I can feel when something is wrong in nature. It’s like my ears and eyes are sharper when I’m in the Wild. Anyway, I started following the scent. This man in a long black coat was walking through the park, and I noticed he didn’t cast a shadow. Middle of a sunny day, and he cast no shadow. He kind of shimmered as he moved.”
    “Like a mirage?” Nico asked.
    “Yes,” Grover said. “And whenever he passed humans—”
    “The humans would pass out,” Nico said. “Curl up and go to sleep.”
    “That’s right! Then after he was gone, they’d get up and go about their business like nothing happened.”
    I stared at Nico. “You know this guy in black?”
    “Afraid so,” Nico said. “Grover, what happened?”
    “I followed the guy. He kept looking up at the buildings around the park like he was making estimates or something. This lady jogger ran by, and she curled up on the sidewalk and started snoring. The guy in black put his hand on her forehead like he was checking her temperature. Then he kept walking. By this time, I knew he was a monster or something even worse. I followed him into this grove, to the base of a big elm tree. I was about to summon some dryads to help me capture him when he turned and . .