'Your friends?' Calypso asked.

Leo nodded. His face felt numb. 'They're preparing for war.'

'Against whom?'

'Look,' Leo said.

The scene changed. A phalanx of Roman demiG.o.ds marched through a moonlit vineyard. An illuminated sign in the distance read: GOLDSMITH WINERY.

'I've seen that sign before,' Leo said. 'That's not far from Camp Half-Blood.'

Suddenly the Roman ranks deteriorated into chaos. DemiG.o.ds scattered. Shields fell. Javelins swung wildly, like the whole group had stepped in fire ants.

Darting through the moonlight were two small hairy shapes dressed in mismatched clothes and garish hats. They seemed to be everywhere at once whacking Romans on the head, stealing their weapons, cutting their belts so their trousers fell around their ankles.

Leo couldn't help grinning. 'Those beautiful little troublemakers! They kept their promise.'

Calypso leaned in, watching the Kerkopes. 'Cousins of yours?'

'Ha, ha, ha, no,' Leo said. 'Couple of dwarfs I met in Bologna. I sent them to slow down the Romans, and they're doing it.'

'But for how long?' Calypso wondered.

Good question. The scene shifted again. Leo saw Octavian that no-good blond scarecrow of an augur. He stood in a gas-station parking lot, surrounded by black SUVs and Roman demiG.o.ds. He held up a long pole wrapped in canvas. When he uncovered it, a golden eagle glimmered at the top.

'Oh, that's not good,' Leo said.

'A Roman standard,' Calypso noted.

'Yeah. And this one shoots lightning, according to Percy.'

As soon as he said Percy's name, Leo regretted it. He glanced at Calypso. He could see in her eyes how much she was struggling, trying to marshal her emotions into neat orderly rows like strands on her loom. What surprised Leo most was the surge of anger he felt. It wasn't just annoyance or jealousy. He was mad at Percy for hurting this girl.

He refocused on the holographic images. Now he saw a single rider Reyna, the praetor from Camp Jupiter flying through a storm on the back of a light-brown pegasus. Reyna's dark hair flew in the wind. Her purple cloak fluttered, revealing the glimmer of her armour. She was bleeding from cuts on her arms and face. Her pegasus's eyes were wild, his mouth slathering from hard riding, but Reyna peered steadfastly forward into the storm.

As Leo watched, a wild gryphon dived out of the clouds. It raked its claws across the horse's ribs, almost throwing Reyna. She drew her sword and slashed the monster down. Seconds later, three venti appeared dark air spirits swirling like miniature tornadoes laced with lightning. Reyna charged them, yelling defiantly.

Then the bronze mirror went dark.

'No!' Leo yelled. 'No, not now. Show me what happens!' He banged on the mirror. 'Calypso, can you sing again or something?'

She glared at him. 'I suppose that is your girlfriend? Your Penelope? Your Elizabeth? Your Annabeth?'

'What?' Leo couldn't figure this girl out. Half the stuff she said made no sense. 'That's Reyna. She's not my girlfriend! I need to see more! I need '

NEED, a voice rumbled in the ground beneath his feet. Leo staggered, suddenly feeling like he was standing on the surface of a trampoline.

NEED is an overused word. A swirling human figure erupted from the sand Leo's least favourite G.o.ddess, the Mistress of Mud, the Princess of Potty Sludge, Gaia herself.

Leo threw a pair of pliers at her. Unfortunately she wasn't solid and they pa.s.sed right through. Her eyes were closed, but she didn't look asleep, exactly. She had a smile on her dust-devil face, as if she was intently listening to her favourite song. Her sandy robes shifted and folded, reminding Leo of the undulating fins on that stupid shrimpzilla monster they'd fought in the Atlantic. For his money, though, Gaia was uglier.

You want to live, Gaia said. You want to join your friends. But you do not need this, my poor boy. It would make no difference. Your friends will die, regardless.

Leo's legs shook. He hated it, but whenever this witch appeared he felt like he was eight years old again, trapped in the lobby of his mom's machine shop, listening to Gaia's soothing evil voice while his mother was locked inside the burning warehouse, dying from heat and smoke.

'What I don't need,' he growled, 'is more lies from you, Dirt Face. You told me my great-granddad died in the 1960s. Wrong! You told me I couldn't save my friends in Rome. Wrong! You told me a lot of things.'

Gaia's laughter was a soft rustling sound, like gravel trickling down a hill in the first moments of an avalanche.

I tried to help you make better choices. You could have saved yourself. But you defied me at every step. You built your ship. You joined that foolish quest. Now you are trapped here, helpless, while the mortal world dies.

Leo's hands burst into flame. He wanted to melt Gaia's sandy face to gla.s.s. Then he felt Calypso's hand on his shoulder.

'Gaia.' Her voice was stern and steady. 'You are not welcome.'

Leo wished he could sound as confident as Calypso. Then he remembered that this annoying fifteen-year-old girl was actually the immortal daughter of a t.i.tan.

Ah, Calypso. Gaia raised her arms as if for a hug. Still here, I see, despite the G.o.ds' promises. Why do you think that is, my dear grandchild? Are the Olympians being spiteful, leaving you with no company except this undergrown fool? Or have they simply forgotten you, because you are not worth their time?

Calypso stared straight through the swirling face of Gaia, all the way to the horizon.

Yes, Gaia murmured sympathetically. The Olympians are faithless. They do not give second chances. Why do you hold out hope? You supported your father, Atlas, in his great war. You knew that the G.o.ds must be destroyed. Why do you hesitate now? I offer you a chance that Zeus would never give you.

'Where were you these last three thousand years?' Calypso asked. 'If you are so concerned with my fate, why do you visit me only now?'

Gaia turned up her palms. The earth is slow to wake. War comes in its own time. But do not think it will pa.s.s you by on Ogygia. When I remake the world, this prison will be destroyed as well.

'Ogygia destroyed?' Calypso shook her head, as if she couldn't imagine those two words going together.

You do not have to be here when that happens, Gaia promised. Join me now. Kill this boy. Spill his blood upon the earth, and help me to wake. I will free you and grant you any wish. Freedom. Revenge against the G.o.ds. Even a prize. Would you still have the demiG.o.d Percy Jackson? I will spare him for you. I will raise him from Tartarus. He will be yours to punish or to love, as you choose. Only kill this trespa.s.sing boy. Show your loyalty.

Several scenarios went through Leo's head none of them good. He was positive Calypso would strangle him on the spot, or order her invisible wind servants to chop him into a Leo puree.

Why wouldn't she? Gaia was making her the ultimate deal kill one annoying guy, get a handsome one free!

Calypso thrust her hand towards Gaia in a three-fingered gesture Leo recognized from Camp Half-Blood: the Ancient Greek ward against evil. 'This is not just my prison, Grandmother. It is my home. And you are the trespa.s.ser.'

The wind ripped Gaia's form into nothingness, scattering the sand into the blue sky.

Leo swallowed. 'Uh, don't take this the wrong way, but you didn't kill me. Are you crazy?'

Calypso's eyes smouldered with anger, but for once Leo didn't think the anger was aimed at him. 'Your friends must need you, or else Gaia would not ask for your death.'

'I uh, yeah. I guess.'

'Then we have work to do,' she said. 'We must get you back to your ship.'

LII.

LEO.

LEO THOUGHT HE'D BEEN BUSY BEFORE. When Calypso set her mind to something, she was a machine.

Within a day, she'd gathered enough supplies for a weeklong voyage food, flasks of water, herbal medicines from her garden. She wove a sail big enough for a small yacht and made enough rope for all the rigging.

She got so much done that by the second day she asked Leo if he needed any help with his own project.

He looked up from the circuit board that was slowly coming together. 'If I didn't know better, I'd think you were anxious to get rid of me.'

'That's a bonus,' she admitted. She was dressed for work in a pair of jeans and a grubby white T-shirt. When he asked her about the wardrobe change, she claimed she had realized how practical these clothes were after making some for Leo.

In the blue jeans, she didn't look much like a G.o.ddess. Her T-shirt was covered with gra.s.s and dirt stains, like she'd just run through a swirling Gaia. Her feet were bare. Her cinnamon-toast hair was tied back, which made her almond eyes look even larger and more startling. Her hands were calloused and blistered from working with rope.

Looking at her, Leo felt a tugging in his stomach that he couldn't quite explain.

'So?' she prompted.

'So ... what?'

She nodded at the circuitry. 'So can I help? How is it coming on?'

'Oh, uh, I'm good here. I guess. If I can wire this thing up to the boat, I should be able to navigate back to the world.'

'Now all you need is a boat.'

He tried to read her expression. He wasn't sure if she was annoyed that he was still here or wistful that she wasn't leaving too. Then he looked at all the supplies she'd stacked up easily enough for two people for several days.

'What Gaia said ...' He hesitated. 'About you getting off this island. Would you want to try it?'

She scowled. 'What do you mean?'

'Well ... I'm not saying it would be fun having you along, always complaining and glaring at me and stuff. But I suppose I could stand it, if you wanted to try.'

Her expression softened just a little.

'How n.o.ble,' she muttered. 'But no, Leo. If I tried to come with you, your tiny chance of escape would be no chance at all. The G.o.ds have placed ancient magic on this island to keep me here. A hero can leave. I cannot. The most important thing is getting you free so you can stop Gaia. Not that I care what happens to you,' she added quickly. 'But the world's fate is at stake.'

'Why would you care about that?' he asked. 'I mean, after being away from the world for so long?'

She arched her eyebrows, as if surprised that he'd asked a sensible question. 'I suppose I don't like being told what to do by Gaia or anyone else. As much as I hate the G.o.ds sometimes, over the past three millennia I've come to see that they're better than the t.i.tans. They're definitely better than the giants. At least the G.o.ds kept in touch. Hermes has always been kind to me. And your father, Hephaestus, has often visited. He is a good person.'

Leo wasn't sure what to make of her faraway tone. She almost sounded like she was pondering his worth, not his dad's.

She reached out and closed his mouth. He hadn't realized it was hanging open.

'Now,' Calypso said, 'how can I help?'

'Oh.' He stared down at his project, but when he spoke he blurted out an idea that had been forming ever since Calypso had made his new clothes. 'You know that flameproof cloth? You think you could make me a little bag of that fabric?'

He described the dimensions. Calypso waved her hand impatiently. 'That will only take minutes. Will it help on your quest?'

'Yeah. It might save a life. And, um, could you chip off a little piece of crystal from your cave? I don't need much.'

She frowned. 'That's an odd request.'

'Humour me.'

'All right. Consider it done. I'll make the fireproof pouch tonight at the loom, when I've cleaned up. But what can I do now, while my hands are dirty?'

She held up her calloused, grimy fingers. Leo couldn't help thinking there was nothing hotter than a girl who didn't mind getting her hands dirty. But of course that was just a general comment. Didn't apply to Calypso. Obviously.

'Well,' he said, 'you could twist some more bronze coils. But that's kind of specialized '

She pushed in next to him on the bench and began to work, her hands braiding the bronze wiring faster than he could have. 'Just like weaving,' she said. 'This isn't so hard.'

'Huh,' Leo said. 'Well, if you ever get off this island and want a job, let me know. You're not a total klutz.'

She smirked. 'A job, eh? Making things in your forge?'

'Nah, we could start our own shop,' Leo said, surprising himself. Starting a machine shop had always been one of his dreams, but he'd never told anyone about it. 'Leo and Calypso's Garage: Auto Repair and Mechanical Monsters.'

'Fresh fruits and vegetables,' Calypso offered.

'Lemonade and stew,' Leo added. 'We could even provide entertainment. You could sing and I could, like, randomly burst into flames.'

Calypso laughed a clear, happy sound that made Leo's heart go ka-b.u.mp.

'See,' he said, 'I'm funny.'

She managed to kill her smile. 'You are not funny. Now, get back to work, or no lemonade and stew.'

'Yes, ma'am,' he said. They worked in silence, side by side, for the rest of the afternoon.

Two nights later, the guidance console was finished.

Leo and Calypso sat on the beach, near the spot where Leo had destroyed the dining table, and they ate a picnic dinner together. The full moon turned the waves to silver. Their campfire sent orange sparks into the sky. Calypso wore a fresh white shirt and her jeans, which she'd apparently decided to live in.