Everyone looked around uncomfortably. Annabeth was a daughter of Athena, and a final stand didn’t sound good.

  ‘Hey… we shouldn’t jump to conclusions,’ Silena said. ‘Annabeth isn’t the only child of Athena, right?’

  ‘But who’s this ghost king?’ Beckendorf asked.

  No one answered. I thought about the Iris-message I’d seen of Nico summoning spirits. I had a bad feeling the prophecy was connected to that.

  ‘Are there more lines?’ Chiron asked. ‘The prophecy does not sound complete.’

  Annabeth hesitated. ‘I don’t remember exactly.’

  Chiron raised an eyebrow. Annabeth was known for her memory. She never forgot something she had heard.

  Annabeth shifted on her bench. ‘Something about… Destroy with a hero’s final breath’

  And?’ Chiron asked.

  She stood. ‘Look, the point is, I have to go in. I’ll find the workshop and stop Luke. And… I need help.’ She turned to me. ‘Will you come?’

  I didn’t even hesitate. ‘I’m in.’

  She smiled for the first time in days, and that made it all worthwhile. ‘Grover, you too? The wild god is waiting.’

  Grover seemed to forget how much he hated the underground. The line about the ‘lost one’ had completely energized him. ‘I’ll pack extra recyclables for snacks!’

  And Tyson,’ Annabeth said. ‘I’ll need you, too.’

  ‘Yay! Blow-things-up time!’ Tyson clapped so hard he woke up Mrs O’Leary, who was dozing in the corner.

  ‘Wait, Annabeth,’ Chiron said. ‘This goes against the ancient laws. A hero is allowed only two companions.’

  ‘I need them all,’ she insisted. ‘Chiron, it’s important.’

  I didn’t know why she was so certain, but I was happy she’d included Tyson. I couldn’t imagine leaving him behind. He was huge and strong and great at figuring out mechanical things. Unlike satyrs, Cyclopes had no problem underground.

  ‘Annabeth.’ Chiron flicked his tail nervously. ‘Consider well. You would be breaking the ancient laws, and there are always consequences. Last winter, five went on a quest to save Artemis. Only three came back. Think on that. Three is a sacred number. There are three Fates, three Furies, three Olympian sons of Kronos. It is a good strong number that stands against many dangers. Four… this is risky.’

  Annabeth took a deep breath. ‘I know. But we have to. Please.’

  I could tell Chiron didn’t like it. Quintus was studying us, like he was trying to decide which of us would come back alive.

  Chiron sighed. ‘Very well. Let us adjourn. The members of the quest must prepare themselves. Tomorrow at dawn, we send you into the Labyrinth.’

  Quintus pulled me aside as the council was breaking up.

  ‘I have a bad feeling about this,’ he told me.

  Mrs O’Leary came over, wagging her tail happily. She dropped her shield at my feet, and I threw it for her. Quintus watched her romp after it. I remembered what Juniper had said about him scouting out the maze. I didn’t trust him, but when he looked at me, I saw real concern in his eyes.

  ‘I don’t like the idea of you going down there,’ he said. ‘Any of you. But if you must, I want you to remember something. The Labyrinth exists to fool you. It will distract you. That’s dangerous for half-bloods. We are easily distracted.’

  ‘You’ve been in there?’

  ‘Long ago.’ His voice was ragged. ‘I barely escaped with my life. Most who enter aren’t that lucky.’

  He gripped my shoulder. ‘Percy, keep your mind on what matters most. If you can do that, you might find the way. And, here, I wanted to give you something.’

  He handed me a little silver tube. It was so cold I almost dropped it.

  ‘A whistle?’ I asked.

  ‘A dog whistle,’ Quintus said. ‘For Mrs O’Leary.’

  ‘Um, thanks, but –’

  ‘How will it work in the maze? I’m not a hundred percent certain it will. But Mrs O’Leary is a hellhound. She can appear when called, no matter how far away she is. I’d feel better knowing you had this. If you really need help, use it, but be careful: the whistle is made of Stygian ice.’

  ‘What ice?’

  ‘From the River Styx. Very hard to craft. Very delicate. It cannot melt, but it will shatter when you blow it, so you can only use it once.’

  I thought about Luke, my old enemy. Right before I’d gone on my first quest, Luke had given me a gift, too – magic shoes that had been designed to drag me to my death. Quintus seemed so nice. So concerned. And Mrs O’Leary liked him, which had to count for something. She dropped the slimy shield at my feet and barked excitedly.

  I felt ashamed that I could even think about mistrusting Quintus. But, then again, I’d trusted Luke once.

  ‘Thanks,’ I told Quintus. I slipped the freezing whistle into my pocket, promising myself that I would never use it, and I dashed off to find Annabeth.

  As long as I’d been at camp, I’d never been inside the Athena cabin.

  It was a silvery building, nothing fancy, with plain white curtains and a carved stone owl over the doorway. The owl’s onyx eyes seemed to follow me as I walked closer.

  ‘Hello?’ I called inside.

  Nobody answered. I stepped in and caught my breath. The place was a workshop for brainiac kids. The bunks were all pushed against one wall as if sleeping didn’t matter very much. Most of the room was filled with workbenches and tables and sets of tools and weapons. The back of the room was a huge library, crammed with old scrolls and leather-bound books and paperbacks. There was an architect’s draughting table with a bunch of rulers and protractors, and some 3-D models of buildings. Huge old war maps were plastered to the ceiling. Sets of armour hung under the windows, their bronze plates glinting in the sun.

  Annabeth stood in the back of the room, rifling through old scrolls.

  ‘Knock, knock?’ I said.

  She turned with a start. ‘Oh… hi. Didn’t hear you.’

  ‘You okay?’

  She frowned at the scroll in her hands. ‘Just trying to do some research. Daedalus’s Labyrinth is so huge. None of the stories agree about anything. The maps just lead from nowhere to nowhere.’

  I thought about what Quintus had said, how the maze tries to distract you. I wondered if Annabeth knew that already.

  ‘We’ll figure it out,’ I promised.

  Her hair had come loose and was hanging in a tangled blonde curtain all around her face. Her grey eyes looked almost black.

  ‘I’ve wanted to lead a quest since I was seven,’ she said.

  ‘You’re going to be awesome.’

  She looked at me gratefully, but then stared down at all the books and scrolls she’d pulled from the shelves. ‘I’m worried, Percy. Maybe I shouldn’t have asked you to do this. Or Tyson and Grover.’

  ‘Hey, we’re your friends. We wouldn’t miss it.’

  ‘But…,’ She stopped herself.

  ‘What is it?’ I asked. ‘The prophecy?’

  ‘I’m sure it’s fine,’ she said in a small voice.

  ‘What was the last line?’

  Then she did something that really surprised me. She blinked back tears and put out her arms.

  I stepped forward and hugged her. Butterflies started turning my stomach into a mosh pit.

  ‘Hey, it’s… it’s okay.’ I patted her back.

  I was aware of everything in the room. I felt like I could read the tiniest print on any book on the shelves. Annabeth’s hair smelled like lemon soap. She was shivering.

  ‘Chiron might be right,’ she muttered. ‘I’m breaking the rules. But I don’t know what else to do. I need you three. It just feels right.’

  ‘Then don’t worry about it,’ I managed. ‘We’ve had plenty of problems before, and we solved them.’

  ‘This is different. I don’t want anything happening to… any of you.’

  Behind me, somebody cleared his throat.

  It was one of Annabeth’s half-brothers,
Malcolm. His face was bright red. ‘Um, sorry,’ he said. ‘Archery practice is starting, Annabeth. Chiron said to come find you.’

  I stepped away from Annabeth. ‘We were just looking at maps,’ I said stupidly.

  Malcolm stared at me. ‘Okay.’

  ‘Tell Chiron I’ll be right there,’ Annabeth said, and Malcolm left in a hurry.

  Annabeth rubbed her eyes. ‘You go ahead, Percy. I’d better get ready for archery.’

  I nodded, feeling more confused than I ever had in my life. I wanted to run from the cabin… but then again I didn’t.

  ‘Annabeth?’ I said. ‘About your prophecy. The line about a hero’s last breath –’

  ‘You’re wondering which hero? I don’t know.’

  ‘No. Something else. I was thinking the last line usually rhymes with the one before it. Was it something about – did it end in the word death?’

  Annabeth stared down at her scrolls. ‘You’d better go, Percy. Get ready for the quest. I’ll – I’ll see you in the morning.’

  I left her there, staring at maps that led from nowhere to nowhere, but I couldn’t shake the feeling that one of us wasn’t going to come back from this quest alive.

  5 Nico Buys Happy Meals For The Dead

  At least I got a good night’s sleep before the quest, right?

  Wrong.

  That night in my dreams, I was in the stateroom of the Princess Andromeda. The windows were open on a moonlit sea. Cold wind rustled the velvet drapes.

  Luke knelt on a Persian rug in front of the golden sarcophagus of Kronos. In the moonlight, Luke’s blond hair looked pure white. He wore an Ancient Greek chiton and a white himation, a kind of cape that flowed down his shoulders. The white clothes made him look timeless and a little unreal, like one of the minor gods on Mount Olympus. The last time I’d seen him, he’d been broken and unconscious after a nasty fall from Mount Tam. Now he looked perfectly fine. Almost too healthy.

  ‘Our spies report success, my lord,’ he said. ‘Camp Half-Blood is sending a quest, as you predicted. Our side of the bargain is almost complete.’

  Excellent. The voice of Kronos didn’t so much speak as pierce my mind like a dagger. It was freezing with cruelty. Once we have the means to navigate, I will lead the vanguard through myself.

  Luke closed his eyes as if collecting his thoughts. ‘My lord, perhaps it is too soon. Perhaps Krios or Hyperion should lead –’

  No. The voice was quiet but absolutely firm. I will lead. One more heart shall join our cause, and that will be sufficient. At last, I shall rise fully from Tartarus.

  ‘But the form, my lord…’ Luke’s voice started shaking.

  Show me your sword, Luke Castellan.

  A jolt went through me. I realized I’d never heard Luke’s last name before. It had never even occurred to me.

  Luke drew his sword. Backbiter’s double edge glowed wickedly – half steel, half celestial bronze. I’d almost been killed several times by that sword. It was an evil weapon, able to kill both mortals and monsters. It was the only blade I really feared.

  You pledged yourself to me, Kronos reminded him. You took this sword as proof of your oath.

  ‘Yes, my lord. It’s just –’

  You wanted power. I gave you that. You are now beyond harm. Soon you will rule the world of gods and mortals. Do you not wish to avenge yourself? To see Olympus destroyed?

  A shiver ran through Luke’s body. ‘Yes.’

  The coffin glowed, golden light filling the room. Then make ready the strike force. As soon as the bargain is done, we shall move forward. First, Camp Half-Blood will be reduced to ashes. Once those bothersome heroes are eliminated, we will march on Olympus.

  There was a knock on the stateroom doors. The light of the coffin faded. Luke rose. He sheathed his sword, adjusted his white clothes, and took a deep breath.

  ‘Come in.’

  The doors opened. Two dracaenae slithered in – snake women with double serpent trunks instead of legs. Between them walked Kelli, the empousa cheerleader from my freshman orientation.

  ‘Hello, Luke.’ Kelli smiled. She was wearing a red dress and she looked awesome, but I’d seen her real form. I knew what she was hiding: mismatched legs, red eyes, fangs and flaming hair.

  ‘What is it, demon?’ Luke’s voice was cold. ‘I told you not to disturb me.’

  Kelli pouted. ‘That’s not very nice. You look tense. How about a nice shoulder massage?’

  Luke stepped back. ‘If you have something to report, say it. Otherwise leave!’

  ‘I don’t know why you’re so huffy these days. You used to be fun to hang out with.’

  ‘That was before I saw what you did to that boy in Seattle.’

  ‘Oh, he meant nothing to me,’ Kelli said. ‘Just a snack, really. You know my heart belongs to you, Luke.’

  ‘Thanks, but no thanks. Now report or get out.’

  Kelli shrugged. ‘Fine. The advance team is ready, as you requested. We can leave –’ She frowned.

  ‘What is it?’ Luke asked.

  ‘A presence,’ Kelli said. ‘Your senses are getting dull, Luke. We’re being watched.’

  She scanned the stateroom. Her eyes focused right on me. Her face withered into a hag’s. She bared her fangs and lunged.

  I woke with a start, my heart pounding. I could’ve sworn the empous’s fangs were an inch from my throat.

  Tyson was snoring in the next bunk. The sound calmed me down a little.

  I didn’t know how Kelli could sense me in a dream, but I’d heard more than I wanted to know. An army was ready. Kronos would lead it personally. All they needed was a way to navigate the Labyrinth so they could invade and destroy Camp Half-Blood, and Luke apparently thought that was going to happen very soon.

  I was tempted to go and wake up Annabeth and tell her, middle of the night or not. Then I realized the room was lighter than it should have been. A blue-and-green glow was coming from the saltwater fountain, brighter and more urgent than the night before. It was almost like the water was humming.

  I got out of bed and approached.

  No voice spoke out of the water asking for a deposit this time. I got the feeling the fountain was waiting for me to make the first move.

  I probably should’ve gone back to bed. Instead I thought about what I’d seen last night – the weird image of Nico at the banks of the River Styx.

  ‘You’re trying to tell me something,’ I said.

  No response from the fountain.

  ‘All right,’ I said. ‘Show me Nico di Angelo.’

  I didn’t even throw a coin in, but this time it didn’t matter. It was like some other force had control of the water besides Iris the messenger goddess. The water shimmered. Nico appeared, but he was no longer in the Underworld. He was standing in a graveyard under a starry sky. Giant willow trees loomed all around him.

  He was watching some gravediggers at work. I heard shovels and saw dirt flying out of a hole. Nico was dressed in a black cloak. The night was foggy. It was warm and humid and frogs were croaking. A large Wal-Mart bag sat next to Nico’s feet.

  ‘Is it deep enough yet?’ Nico asked. He sounded irritated.

  ‘Nearly, my lord.’ It was the same ghost I’d seen Nico with before, the faint shimmering image of a man. ‘But, my lord, I tell you, this is unnecessary. You already have me for advice.’

  ‘I want a second opinion!’ Nico snapped his fingers, and the digging stopped. Two figures climbed out of the hole. They weren’t people. They were skeletons in ragged clothes.

  ‘You are dismissed,’ Nico said. ‘Thank you.’

  The skeletons collapsed into piles of bones.

  ‘You might as well thank the shovels,’ the ghost complained. ‘They have as much sense.’

  Nico ignored him. He reached into his Wal-Mart bag and pulled out a twelve-pack of Coke. He popped open a can. Instead of drinking it, he poured it into the grave.

  ‘Let the dead taste again,’ he murmured. ‘Let them rise and
take this offering. Let them remember.’

  He dropped the rest of the Cokes into the grave and pulled out a white paper bag decorated with cartoons. I hadn’t seen one in years, but I recognized it – a McDonald’s Happy Meal.

  He turned it upside down and shook the fries and hamburger into the grave.

  ‘In my day, we used animal blood,’ the ghost mumbled. ‘It’s perfectly good enough. They can’t taste the difference.’

  ‘I will treat them with respect,’ Nico said.

  ‘At least let me keep the toy,’ the ghost said.

  ‘Be quiet!’ Nico ordered. He emptied another twelve-pack of soda and three more Happy Meals into the grave, then began chanting in Ancient Greek. I only caught some of the words – a lot about the dead and memories and returning from the grave. Real happy stuff.

  The grave started to bubble. Frothy brown liquid rose to the top like the whole thing was filling with soda. The fog thickened. The frogs stopped croaking. Dozens of figures began to appear among the gravestones: bluish, vaguely human shapes. Nico had summoned the dead with Coke and cheeseburgers.

  ‘There are too many,’ the ghost said nervously. ‘You don’t know your own powers.’

  ‘I’ve got it under control,’ Nico said, though his voice sounded fragile. He drew his sword – a short blade made of solid black metal. I’d never seen anything like it. It wasn’t celestial bronze or steel. Iron, maybe? The crowd of shades retreated at the sight of it.

  ‘One at a time,’ Nico commanded.

  A single figure floated forward and knelt at the pool. It made slurping sounds as it drank. Its ghostly hands scooped french fries out of the pool. When it stood again, I could see it much more clearly – a teenage guy in Greek armour. He had curly hair and green eyes, a clasp shaped like a seashell on his cloak.

  ‘Who are you?’ Nico said. ‘Speak.’

  The young man frowned as if trying to remember. Then he spoke in a voice like dry, crumpling paper: ‘I am Theseus.’

  No way, I thought. This couldn’t be the Theseus. He was just a kid. I’d grown up hearing stories about him fighting the Minotaur and stuff, but I’d always pictured him as this huge, buff guy. The ghost I was looking at wasn’t strong or tall. And he wasn’t any older than I was.