The ship went silent, except for the waves lapping against the hull.

"Okay, I'll bite," Leo said at last. "What happened to it?"

"It disappeared," Annabeth said.

Leo frowned. "How does a forty-foot-tall statue in the middle of the Parthenon just disappear?"

"That's a good question," Annabeth said. "It's one of the biggest mysteries in history. Some people thought the statue was melted down for its gold, or destroyed by invaders. Athens was sacked a number of times. Some thought the statue was carried off-"

"By Romans," Jason finished. "At least, that's one theory, and it fits the legend I heard at Camp Jupiter. To break the Greeks' spirit, the Romans carted off the Athena Parthenos when they took over the city of Athens. They hid it in an underground shrine in Rome. The Roman demigods swore it would never see the light of day. They literally stole Athena, so she could no longer be the symbol of Greek military power. She became Minerva, a much tamer goddess."

"And the children of Athena have been searching for the statue ever since," Annabeth said. "Most don't know about the legend, but in each generation, a few are chosen by the goddess. They're given a coin like mine. They follow the Mark of Athena...a kind of magical trail that links them to the statue...hoping to find the resting place of the Athena Parthenos and get the statue back."

Piper watched the two of them-Annabeth and Jason-with quiet amazement. They spoke like a team, without any hostility or blame. The two of them had never really trusted each other. Piper was close enough to both of them to know that. But now...if they could discuss such a huge problem so calmly-the ultimate source of Greek/Roman hatred-maybe there was hope for the two camps, after all.

Percy seemed be having similar thoughts, judging from his surprised expression. "So if we-I mean you-find the statue...what would we do with it? Could we even move it?"

"I'm not sure," Annabeth admitted. "But if we could save it somehow, it could unite the two camps. It could heal my mother of this hatred she's got, tearing her two aspects apart. And maybe...maybe the statue has some sort of power that could help us against the giants."

Piper stared at Annabeth with awe, just starting to appreciate the huge responsibility her friend had taken on. And Annabeth meant to do it alone.

"This could change everything," Piper said. "It could end thousands of years of hostility. It might be the key to defeating Gaea. But if we can't help you..."

She didn't finish, but the question seemed to hang in the air: Was saving the statue even possible?

Annabeth squared her shoulders. Piper knew she must be terrified inside, but she did a good job hiding it.

"I have to succeed," Annabeth said simply. "The risk is worth it."

Hazel twirled her hair pensively. "I don't like the idea of you risking your life alone, but you're right. We saw what recovering the golden eagle standard did for the Roman legion. If this statue is the most powerful symbol of Athena ever created-"

"It could kick some serious booty," Leo offered.

Hazel frowned. "That wasn't the way I'd put it, but yes."

"Except..." Percy took Annabeth's hand again. "No child of Athena has ever found it. Annabeth, what's down there? What's guarding it? If it's got to do with spiders-?"

"Won through pain from a woven jail," Frank recalled. "Woven, like webs?"

Annabeth's face turned as white as printer paper. Piper suspected that Annabeth knew what awaited her...or at least that she had a very good idea. She was trying to hold down a wave of panic and terror.

"We'll deal with that when we get to Rome," Piper suggested, putting a little charmspeak in her voice to soothe her friend's nerves. "It's going to work out. Annabeth is going to kick some serious booty, too. You'll see."

"Yeah," Percy said. "I learned a long time ago: Never bet against Annabeth."

Annabeth looked at them both gratefully.

Judging from their half-eaten breakfasts, the others still felt uneasy; but Leo managed to shake them out of it. He pushed a button, and a loud blast of steam exploded from Festus's mouth, making everyone jump.

"Well!" he said. "Good pep rally, but there's still a ton of things to fix on this ship before we get to the Mediterranean. Please report to Supreme Commander Leo for your superfun list of chores!"

Piper and Jason took charge of cleaning the lower deck, which had been thrown into chaos during the monster attack. Reorganizing sickbay and battening down the storage area took them most of the day, but Piper didn't mind. For one thing, she got to spend time with Jason. For another, last night's explosions had given Piper a healthy respect for Greek fire. She didn't want any loose vials of that stuff rolling through the corridors in the middle of the night.

As they were fixing up the stables, Piper thought about the night Annabeth and Percy had spent down here accidentally. Piper wished that she could talk with Jason all night-just curl up on the stable floor and enjoy being with him. Why didn't they get to break the rules?

But Jason wasn't like that. He was hardwired to be a leader and set a good example. Breaking the rules didn't come naturally to him.

No doubt Reyna admired that about him. Piper did too...mostly.

The one time she'd convinced him to be a rebel was back at the Wilderness School, when they had sneaked onto the roof at night to watch a meteor shower. That's where they'd had their first kiss.

Unfortunately, that memory was a trick of the Mist, a magical lie implanted in her head by Hera. Piper and Jason were together now, in real life, but their relationship had been founded on an illusion. If Piper tried to get the real Jason to sneak out at night, would he do it?

She swept the hay into piles. Jason fixed a broken door on one of the stables. The glass floor hatch glowed from the ocean below-a green expanse of light and shadow that seemed to go down forever. Piper kept glancing over, afraid she'd see a monster's face peeping in, or the water cannibals from her grandfather's old stories; but all she saw was an occasional school of herring.

As she watched Jason work, she admired how easily he did each task, whether it was fixing a door or oiling saddles. It wasn't just his strong arms and his skillful hands, though Piper liked those just fine, but the way he acted so upbeat and confident. He did what needed to be done without complaint. He kept his sense of humor, despite the fact that the guy had to be dead on his feet after not having slept the night before. Piper couldn't blame Reyna for having a crush on him. When it came to work and duty, Jason was Roman to the core.

Piper thought about her mother's tea party in Charleston. She wondered what the goddess had told Reyna a year ago, and why it had changed the way Reyna treated Jason. Had Aphrodite encouraged or discouraged her to like Jason?

Piper wasn't sure, but she wished her mom hadn't appeared in Charleston. Regular mothers were embarrassing enough. Godly glamour moms who invited your friends over for tea and guy talk-that was just mortifying.

Aphrodite had paid so much attention to Annabeth and Hazel, it had made Piper uneasy. When her mom got interested in somebody's love life, usually that was a bad sign. It meant trouble was coming. Or as Aphrodite would say, twists and turns.

But also, Piper was secretly hurt not to have her mother to herself. Aphrodite had barely looked at her. She hadn't said a word about Jason. She hadn't bothered explaining her conversation with Reyna at all.

It was almost as if Aphrodite no longer found Piper interesting. Piper had gotten her guy. Now it was up to her to make things work, and Aphrodite had moved on to newer gossip as easily as she might toss out an old copy of a tabloid magazine.

All of you are such excellent stories, Aphrodite had said. I mean, girls.

Piper hadn't appreciated that, but part of her had thought: Fine. I don't want to be a story. I want a nice steady life with a nice steady boyfriend.

If only she knew more about making relationships work. She was supposed to be an expert, being the head counselor for Aphrodite cabin. Other campers at Camp Half-Blood came to her for advice all the time. Piper had tried to do her best, but with her own boyfriend, she was clueless. She was constantly second-guessing herself, reading too much into Jason's expressions, his moods, his offhand comments. Why did it have to be so hard? Why couldn't there be a happily-ever-after ride-into-the-sunset feeling all the time?

"What are you thinking?" Jason asked.

Piper realized she'd been making a sour face. In the reflection of the glass bay doors, she looked like she'd swallowed a teaspoon of salt.

"Nothing," she said. "I mean...a lot of things. Kind of all at once."

Jason laughed. The scar on his lip almost disappeared when he smiled. Considering all the stuff he'd been through, it was amazing that he could be in such a good mood.

"It's going to work out," he promised. "You said so yourself."

"Yeah," Piper agreed. "Except I was just saying that to make Annabeth feel better."

Jason shrugged. "Still, it's true. We're almost to the ancient lands. We've left the Romans behind."

"And now they're on their way to Camp Half-Blood to attack our friends."

Jason hesitated, as if it was hard for him to put a positive spin on that. "Chiron will find a way to stall them. The Romans might take weeks to actually find the camp and plan their attack. Besides, Reyna will do what she can to slow things down. She's still on our side. I know she is."

"You trust her." Piper's voice sounded hollow, even to herself.

"Look, Pipes. I told you, you've got nothing to be jealous about."

"She's beautiful. She's powerful. She's so...Roman."

Jason put down his hammer. He took her hand, which sent a tingle up her arm. Piper's dad had once taken her to the Aquarium of the Pacific and shown her an electric eel. He told her that the eel sent out pulses that shocked and paralyzed its prey. Every time Jason looked at her or touched her hand, Piper felt like that.

"You're beautiful and powerful," he said. "And I don't want you to be Roman. I want you to be Piper. Besides, we're a team, you and me."

She wanted to believe him. They'd been together, really, for months now. Still, she couldn't get rid of her doubts, any more than Jason could get rid of the SPQR tattoo burned on his forearm.

Above them, the ship's bell rang for dinner.

Jason smirked. "We'd better get up there. We don't want Coach Hedge tying bells around our necks."

Piper shuddered. Coach Hedge had threatened to do that after the Percy/Annabeth scandal, so he'd know if anyone sneaked out at night.

"Yeah," she said regretfully, looking at the glass doors below their feet. "I guess we need dinner...and a good night's sleep."

The next morning Piper woke to a different ship's horn-a blast so loud it literally shook her out of bed.

She wondered if Leo was pulling another joke. Then the horn boomed again. It sounded like it was coming from several hundred yards away-from another vessel.

She rushed to get dressed. By the time she got up on deck, the others had already gathered-all hastily dressed except for Coach Hedge, who had pulled the night watch.

Frank's Vancouver Winter Olympics shirt was inside out. Percy wore pajama pants and a bronze breastplate, which was an interesting fashion statement. Hazel's hair was all blown to one side, as though she'd walked through a cyclone; and Leo had accidentally set himself on fire. His T-shirt was in charred tatters. His arms were smoking.

About a hundred yards to port, a massive cruise ship glided past. Tourists waved at them from fifteen or sixteen rows of balconies. Some smiled and took pictures. None of them looked surprised to see an Ancient Greek trireme. Maybe the Mist made it look like a fishing boat, or perhaps the cruisers thought the Argo II was a tourist attraction.

The cruise ship blew its horn again, and the Argo II had a shaking fit.

Coach Hedge plugged his ears. "Do they have to be so loud?"

"They're just saying hi," Frank speculated.

"WHAT?" Hedge yelled back.

The ship edged past them, heading out to sea. The tourists kept waving. If they found it strange that the Argo II was populated by half-asleep kids in armor and pajamas and a man with goat legs, they didn't let on.

"Bye!" Leo called, raising his smoking hand.

"Can I man the ballistae?" Hedge asked.

"No," Leo said through a forced smile.

Hazel rubbed her eyes and looked across the glittering green water. "Where are-oh...Wow."

Piper followed her gaze and gasped. Without the cruise ship blocking their view, she saw a mountain jutting from the sea less than half a mile to the north. Piper had seen impressive cliffs before. She'd driven Highway 1 along the California coast. She'd even fallen down the Grand Canyon with Jason and flown back up. But neither was as amazing as this massive fist of blinding white rock thrust into the sky. On one side, the limestone cliffs were almost completely sheer, dropping into the sea over a thousand feet below, as near as Piper could figure. On the other side, the mountain sloped in tiers, covered in green forest, so that the whole thing reminded Piper of a colossal sphinx, worn down over the millennia, with a massive white head and chest, and a green cloak over its back.

"The Rock of Gibraltar," Annabeth said in awe. "At the tip of Spain. And over there-" She pointed south, to a more distant stretch of red and ochre hills. "That must be Africa. We're at the mouth of the Mediterranean."

The morning was warm, but Piper shivered. Despite the wide stretch of sea in front of them, she felt like she was standing at an impassable barrier. Once in the Mediterranean-the Mare Nostrum-they would be in the ancient lands. If the legends were true, their quest would become ten times more dangerous.

"What now?" she asked. "Do we just sail in?"

"Why not?" Leo said. "It's a big shipping channel. Boats go in and out all the time."

Not triremes full of demigods, Piper thought.

Annabeth gazed at the Rock of Gibraltar. Piper recognized that brooding expression on her friend's face. It almost always meant that she anticipated trouble.

"In the old days," Annabeth said, "they called this area the pillars of Hercules. The Rock was supposed to be one pillar. The other was one of the African mountains. Nobody is sure which one."

"Hercules, huh?" Percy frowned. "That guy was like the Starbucks of Ancient Greece. Everywhere you turn-there he is."

A thunderous boom shook the Argo II, though Piper wasn't sure where it came from this time. She didn't see any other ships, and the skies were clear.

Her mouth suddenly felt dry. "So...these Pillars of Hercules. Are they dangerous?"

Annabeth stayed focused on the white cliffs, as if waiting for the Mark of Athena to blaze to life. "For Greeks, the pillars marked the end of the known world. The Romans said the pillars were inscribed with a Latin warning-"

"Non plus ultra," Percy said.

Annabeth looked stunned. "Yeah. Nothing Further Beyond. How did you know?"

Percy pointed. "Because I'm looking at it."

Directly ahead of them, in the middle of the straits, an island had shimmered into existence. Piper was positive no island had been there before. It was a small hilly mass of land, covered in forests and ringed with white beaches. Not very impressive compared to Gibraltar, but in front of the island, jutting from waves about a hundred yards offshore, were two white Grecian columns as tall as the Argo's masts. Between the columns, huge silver words glittered underwater-maybe an illusion, or maybe inlaid in the sand: NON PLUS ULTRA.

"Guys, do I turn around?" Leo asked nervously. "Or..."

No one answered-maybe because, like Piper, they had noticed the figure standing on the beach. As the ship approached the columns, she saw a dark-haired man in purple robes, his arms crossed, staring intently at their ship as if he were expecting them. Piper couldn't tell much else about him from this distance, but judging from his posture, he wasn't happy.

Frank inhaled sharply. "Could that be-?"

"Hercules," Jason said. "The most powerful demigod of all time."

The Argo II was only a few hundred yards from the columns now.

"Need an answer," Leo said urgently. "I can turn, or we can take off. The stabilizers are working again. But I need to know quick-"

"We have to keep going," Annabeth said. "I think he's guarding these straits. If that's really Hercules, sailing or flying away wouldn't do any good. He'll want to talk to us."

Piper resisted the urge to use charmspeak. She wanted to yell at Leo: Fly! Get us out of here! Unfortunately, she had a feeling that Annabeth was right. If they wanted to pass into the Mediterranean, they couldn't avoid this meeting.

"Won't Hercules be on our side?" she asked hopefully. "I mean...he's one of us, right?"