The Mark of Athena

again. And that spot right there—”

“Please,” Annabeth said. “You’re making me dizzy.”

Rhea Silvia laughed. “I’m sorry, dear. Layers upon layers of history here, but it’s nothing compared to Greece. Athens was old when Rome was a collection of mud huts. You’ll see, if you survive.”

“Not helping,” Annabeth muttered.

“Here we are,” Tiberinus announced. He pulled over in front of a large marble building, the facade covered in city grime but still beautiful. Ornate carvings of Roman gods decorated the roofline. The massive entrance was barred with iron gates, heavily padlocked.

“I’m going in there?” Annabeth wished she’d brought Leo, or at least borrowed some wire cutters from his tool belt.

Rhea Silvia covered her mouth and giggled. “No, my dear. Not in it. Under it.”

Tiberinus pointed to a set of stone steps on the side of the building—the sort that would have led to a basement apartment if this place were in Manhattan.

“Rome is chaotic aboveground,” Tiberinus said, “but that’s nothing compared to below ground. You must descend into the buried city, Annabeth Chase. Find the altar of the foreign god. The failures of your predecessors will guide you. After that…I do not know.”

Annabeth’s backpack felt heavy on her shoulders. She’d been studying the bronze map for days now, scouring Daedalus’s laptop for information. Unfortunately, the few things she had learned made this quest seem even more impossible. “My siblings…none of them made it all the way to the shrine, did they.”

Tiberinus shook his head. “But you know what prize awaits, if you can liberate it.”

“Yes,” Annabeth said.

“It could bring peace to the children of Greece and Rome,” Rhea Silvia said. “It could change the course of the coming war.”

“If I live,” Annabeth said.

Tiberinus nodded sadly. “Because you also understand the guardian you must face?”

Annabeth remembered the spiders at Fort Sumter, and the dream Percy had described—the hissing voice in the dark. “Yes.”

Rhea Silvia looked at her husband. “She is brave. Perhaps she is stronger than the others.”

“I hope so,” said the river god. “Good-bye, Annabeth Chase. And good luck.”

Rhea Silvia beamed. “We have such a lovely afternoon planned! Off to shop!”

Gregory Peck and Audrey Hepburn sped off on their baby-blue motorbike. Then Annabeth turned and descended the steps alone.

She’d been underground plenty of times.

But halfway down the steps, she realized just how long it had been since she’d adventured by herself. She froze.

Gods…she hadn’t done something like this since she was a kid. After running away from home, she’d spent a few weeks surviving on her own, living in alleyways and hiding from monsters until Thalia and Luke took her under their wings. Then, once she’d arrived at Camp Half-Blood, she’d lived there until she was twelve. After that, all her quests had been with Percy or her other friends.

The last time she had felt this scared and alone, she’d been seven years old. She remembered the day Thalia, Luke, and she had wandered into a Cyclopes’ lair in Brooklyn. Thalia and Luke had gotten captured, and Annabeth had had to cut them free. She still remembered shivering in a dark corner of that dilapidated mansion, listening to the Cyclopes mimicking her friends’ voices, trying to trick her into coming out into the open.

What if this is a trick, too? she wondered. What if those other children of Athena died because Tiberinus and Rhea Silvia led them into a trap? Would Gregory Peck and Audrey Hepburn do something like that?

She forced herself to keep going. She had no choice. If the Athena Parthenos was really down here, it could decide the fate of the war. More importantly, it could help her mom. Athena needed her.

At the bottom of the steps she reached an old wooden door with an iron pull ring. Above the ring was a metal plate with a keyhole. Annabeth started considering ways to pick the lock, but as soon as she touched the pull ring, a fiery shape burned in the middle of the door: the silhouette of Athena’s owl. Smoke plumed from the keyhole. The door swung inward.

Annabeth looked up one last time. At the top of the stairwell, the sky was a square of brilliant blue. Mortals would be enjoying the warm afternoon. Couples would be holding hands at the cafes. Tourists would be bustling through the shops and museums. Regular Romans would be going about their daily business, probably not considering the thousands of years of history under their feet, and definitely unaware of the spirits, gods, and monsters that still dwelt here, or the fact that their city might be destroyed today unless a certain group of demigods succeeded in stopping the giants.

Annabeth stepped through the doorway.

She found herself in a basement that was an architectural cyborg. Ancient brick walls were crisscrossed with modern electrical cables and plumbing. The ceiling was held up with a combination of steel scaffolding and old granite Roman columns.

The front half of the basement was stacked with crates. Out of curiosity, Annabeth opened a few. Some were packed with multicolored spools of string—like for kites or arts and crafts projects. Other crates were full of cheap plastic gladiator swords. Maybe at one point this had been a storage area for a tourist shop.

In the back of the basement, the floor had been excavated, revealing another set of steps—these of white stone—leading still deeper underground.