He pulled a chamois cloth from his tool belt and made a big show of wrapping up the physician's cure. Then he presented the package to Piper.

'Okay, then,' he said. 'Athens tomorrow morning, gang. Be ready to fight some giants.'

'Yeah ...' Frank murmured. 'I know I'll sleep well.'

After dinner broke up, Jason and Piper tried to waylay Leo. They wanted to talk about what had happened with Asclepius, but Leo evaded them.

'I've got to work on the engine,' he said, which was true.

Once in the engine room, with only Buford the Wonder Table for company, Leo took a deep breath. He reached into his tool belt and pulled out the actual vial of physician's cure not the trick-of-the-Mist version he'd handed to Piper.

Buford blew steam at him.

'Hey, man, I had to,' Leo said.

Buford activated his holographic Hedge. 'PUT SOME CLOTHES ON!'

'Look, it's got to be this way. Otherwise we'll all die.'

Buford made a plaintive squeal, then clattered into the corner in a sulk.

Leo stared at the engine. He'd spent so much time putting it together. He'd sacrificed months of sweat and pain and loneliness.

Now the Argo II was approaching the end of its voyage. Leo's whole life his childhood with Tia Callida; his mother's death in that warehouse fire; his years as a foster kid; his months at Camp Half-Blood with Jason and Piper all of it would culminate tomorrow morning in one final battle.

He opened the access panel.

Festus's voice creaked over the intercom.

'Yeah, buddy,' Leo agreed. 'It's time.'

More creaking.

'I know,' Leo said. 'Together till the end?'

Festus squeaked affirmatively.

Leo checked the ancient bronze astrolabe, which was now fitted with the crystal from Ogygia. Leo could only hope it would work.

'I will get back to you, Calypso,' he muttered. 'I promised on the River Styx.'

He flipped a switch and brought the navigation device online. He set the timer for twenty-four hours.

Finally he opened the engine's ventilator line and pushed inside the vial of physician's cure. It disappeared into the veins of the ship with a decisive thunk.

'Too late to turn back now,' Leo said.

He curled on the floor and closed his eyes, determined to enjoy the familiar hum of the engine for one last night.

XXXVII.

Reyna

'TURN BACK!'

Reyna wasn't keen to give orders to Pegasus, the Lord of Flying Horses, but she was even less keen to get shot out of the sky.

As they approached Camp Half-Blood in the predawn hours of 1 August, she spotted six Roman onagers. Even in the dark, their Imperial gold plating glinted. Their massive throwing arms bent back like ship masts listing in a storm. Crews of artillerists scurried around the machines, loading the slings, checking the torsion of the ropes.

'What are those?' Nico called.

He flew about twenty feet to her left on the dark pegasus Blackjack.

'Siege weapons,' Reyna said. 'If we get any closer, they can shoot us out of the sky.'

'From this high up?'

On her right, Coach Hedge shouted from the back of his steed, Guido, 'Those are onagers, kid! Those things can kick higher than Bruce Lee!'

'Lord Pegasus,' Reyna said, resting her hand on the stallion's neck, 'we need a safe place to land.'

Pegasus seemed to understand. He wheeled to the left. The other flying horses followed Blackjack, Guido and six others who were towing the Athena Parthenos beneath them on cables.

As they skirted the western edge of the camp, Reyna took in the scene. The legion lined the base of the eastern hills, ready for a dawn attack. The onagers were arrayed behind them in a loose semicircle at three-hundred-yard intervals. Judging from the size of the weapons, Reyna calculated that Octavian had enough firepower to destroy every living thing in the valley.

But that was only part of the threat. Encamped along the legion's flanks were hundreds of auxilia forces. Reyna couldn't see well in the dark, but she spotted at least one tribe of wild centaurs and an army of cynocephali, the dog-headed men who'd made an uneasy truce with the legion centuries ago. The Romans were badly outnumbered, surrounded by a sea of unreliable allies.

'There.' Nico pointed towards Long Island Sound, where the lights of a large yacht gleamed a quarter of a mile offshore. 'We could land on the deck of that ship. The Greeks control the sea.'

Reyna wasn't sure the Greeks would be any friendlier than the Romans, but Pegasus seemed to like the idea. He banked towards the dark waters of the Sound.

The ship was a white pleasure craft a hundred feet long, with sleek lines and dark tinted portals. Painted on the bow in red letters was the name MI AMOR. On the forward deck was a helipad big enough for the Athena Parthenos.

Reyna saw no crew. She guessed the ship was a regular mortal vessel anchored for the night, but if she was wrong and the ship was a trap ...

'It's our best shot,' Nico said. 'The horses are tired. We need to set down.'

She nodded reluctantly. 'Let's do it.'

Pegasus landed on the forward deck with Guido and Blackjack. The six other horses gently set the Athena Parthenos on the helipad and then settled around it. With their cables and harnesses, they looked like carousel animals.

Reyna dismounted. As she had two days ago, when she first met Pegasus, she knelt before the horse.

'Thank you, great one.'

Pegasus spread his wings and inclined his head.

Even now, after flying halfway up the East Coast together, Reyna could scarcely believe the immortal horse had allowed her to ride.

Reyna had always pictured him as solid white with dove-like wings, but Pegasus's coat was rich brown, mottled with red and gold around the muzzle which Hedge claimed were the marks where the stallion had emerged from the blood and ichor of his beheaded mother, Medusa. Pegasus's wings were the colours of an eagle's gold, white, brown and rust which made him look much more handsome and regal than plain white. He was the colour of all horses, representing all his offspring.

Lord Pegasus nickered.

Hedge trotted over to translate. 'Pegasus says he should leave before the shooting starts. His life force connects all pegasi, see, so if he gets injured all winged horses feel his pain. That's why he doesn't get out much. He's immortal, but his offspring aren't. He doesn't want them to suffer on his account. He's asked the other horses to stay with us, to help us complete our mission.'

'I understand,' Reyna said. 'Thank you.'

Pegasus whinnied.

Hedge's eyes widened. He choked back a sob, then fished a handkerchief out of his backpack and dabbed his eyes.

'Coach?' Nico frowned with concern. 'What did Pegasus say?'

'He he says he didn't come to us in person because of my message.' Hedge turned to Reyna. 'He did it because of you. He experiences the feelings of all winged horses. He followed your friendship with Scipio. Pegasus says he's never been more touched by a demigod's compassion for a winged horse. He gives you the title Horse Friend. This is a great honour.'

Reyna's eyes stung. She bowed her head. 'Thank you, lord.'

Pegasus pawed the deck. The other winged horses whinnied in salute. Then their sire launched himself upward and spiralled into the night.

Hedge stared at the clouds in amazement. 'Pegasus hasn't shown himself in hundreds of years.' He patted Reyna on the back. 'You did good, Roman.'

Reyna didn't feel like she deserved credit for putting Scipio through so much suffering, but she forced down her feelings of guilt.

'Nico, we should check the ship,' she said. 'If there's anyone aboard '

'Way ahead of you.' He stroked Blackjack's muzzle. 'I sense two mortals asleep in the main cabin. Nobody else. I'm no child of Hypnos, but I've sent some deep dreams their way. Should be enough to keep them snoozing until well after sunrise.'

Reyna tried not to stare at him. In the last few days he'd become so much stronger. Hedge's nature magic had brought him back from the brink. She'd seen Nico do some impressive things, but manipulating dreams ... had he always been able to do that?

Coach Hedge rubbed his hands eagerly. 'So when can we go ashore? My wife is waiting!'

Reyna scanned the horizon. A Greek trireme patrolled just offshore, but it didn't seem to have noticed their arrival. No alarms sounded. No signs of movement along the beach.

She caught a glimpse of silver wake in the moonlight, half a mile to the west. A black motorboat was speeding towards them with no running lights. Reyna hoped it was a mortal vessel. Then it got closer, and Reyna's hand tightened on the hilt of her sword. Glinting on the boat's prow was a laurel wreath design with the letters SPQR.

'The legion has sent a welcoming committee.'

Nico followed her gaze. 'I thought the Romans didn't have a navy.'

'We didn't,' she said. 'Apparently Octavian has been busier than I realized.'

'So we attack!' Hedge said. ' 'Cause nobody's standing in my way when I'm this close.'

Reyna counted three people in the speedboat. The two in the back wore helmets, but Reyna recognized the driver's wedge-shaped face and stocky shoulders: Michael Kahale.

'We'll try to parlay,' Reyna decided. 'That's one of Octavian's right-hand men, but he's a good legionnaire. I may be able to reason with him.'

The wind swept Nico's dark hair across his face. 'But if you're wrong ...'

The black boat slowed and pulled alongside. Michael called up: 'Reyna! I've got orders to arrest you and confiscate that statue. I'm coming aboard with two other centurions. I'd prefer to do this without bloodshed.'

Reyna tried to control her trembling legs. 'Come aboard, Michael!'

She turned to Nico and Coach Hedge. 'If I'm wrong, be ready. Michael Kahale won't be easy to fight.'

Michael wasn't dressed for combat. He wore only his purple camp shirt, jeans and running shoes. He carried no visible weapon, but that didn't make Reyna feel any better. His arms were as thick as bridge cables, his expression as welcoming as a brick wall. The dove tattoo on his forearm looked more like a bird of prey.

His eyes glittered darkly as he took in the scene the Athena Parthenos harnessed to its team of pegasi, Nico with his Stygian sword drawn, Coach Hedge with his baseball bat.

Michael's backup centurions were Leila from the Fourth Cohort and Dakota from the Fifth. Strange choices ... Leila, daughter of Ceres, wasn't known for her aggressiveness. She was usually quite levelheaded. And Dakota ... Reyna couldn't believe the son of Bacchus, the most good-natured of officers, would side with Octavian.

'Reyna Ramirez-Arellano,' Michael said, like he was reading a scroll, 'former praetor '

'I am praetor,' Reyna corrected. 'Unless I have been removed by a vote of the full senate. Is that the case?'

Michael sighed heavily. His heart didn't seem to be in his task. 'I have orders to arrest you and hold you for trial.'

'On whose authority?'

'You know whose '

'On what charges?'

'Listen, Reyna ' Michael rubbed his palm across his forehead, like it might wipe away his headache 'I don't like this any more than you do. But I have my orders.'

'Illegal orders.'

'It's too late for argument. Octavian has assumed emergency powers. The legion is behind him.'

'Is that true?' She looked pointedly at Dakota and Leila.

Leila wouldn't meet her eyes. Dakota winked like he was trying to convey a message, but it was hard to tell with him. He might've been twitching simply from too much sugary Kool-Aid.

'We're at war,' Michael said. 'We have to pull together. Dakota and Leila have not been the most enthusiastic supporters. Octavian gave them this one last chance to prove themselves. If they help me bring you in preferably alive, but dead if necessary then they keep their rank and prove their loyalty.'

'To Octavian,' Reyna noted. 'Not the legion.'