She turned her pencil around in her fingers. “Percy, as much as I want you to come home”—she sighed like she was mad at herself—“as much as I want you to be safe, I want you to understand something. You need to do whatever you think you have to.”

I stared at her. “What do you mean?”

“I mean, do you really, deep down, believe that you have to help save her? Do you think it’s the right thing to do? Because I know one thing about you, Percy. Your heart is always in the right place. Listen to it.”

“You’re . . . you’re telling me to go?”

My mother pursed her lips. “I’m telling you that . . . you’re getting too old for me to tell you what to do. I’m telling you that I’ll support you, even if what you decide to do is dangerous. I can’t believe I’m saying this.”

“Mom—”

The toilet flushed down the hall in our apartment.

“I don’t have much time,” my mom said. “Percy, whatever you decide, I love you. And I know you’ll do what’s best for Annabeth.”

“How can you be sure?”

“Because she’d do the same for you.”

And with that, my mother waved her hand over the mist, and the connection dissolved, leaving me with one final image of her new friend, Mr. Blowfish, smiling down at her.

I don’t remember falling asleep, but I remember the dream.

I was back in that barren cave, the ceiling heavy and low above me. Annabeth was kneeling under the weight of a dark mass that looked like a pile of boulders. She was too tired even to cry out. Her legs trembled. Any second, I knew she would run out of strength and the cavern ceiling would collapse on top of her.

“How is our mortal guest?” a male voice boomed.

It wasn’t Kronos. Kronos’s voice was raspy and metallic, like a knife scraped across stone. I’d heard it taunting me many times before in my dreams. But this voice was deeper and lower, like a bass guitar. Its force made the ground vibrate.

Luke emerged from the shadows. He ran to Annabeth, knelt beside her, then looked back at the unseen man. “She’s fading. We must hurry.”

The hypocrite. Like he really cared what happened to her.

The deep voice chuckled. It belonged to someone in the shadows, at the edge of my dream. Then a meaty hand thrust someone forward into the light—Artemis—her hands and feet bound in celestial bronze chains.

I gasped. Her silvery dress was torn and tattered. Her face and arms were cut in several places, and she was bleeding ichor, the golden blood of the gods.

“You heard the boy,” said the man in the shadows. “Decide!”

Artemis’s eyes flashed with anger. I didn’t know why she just didn’t will the chains to burst, or make herself disappear, but she didn’t seem able to. Maybe the chains prevented her, or some magic about this dark, horrible place.

The goddess looked at Annabeth and her expression changed to concern and outrage. “How dare you torture a maiden like this!”

“She will die soon,” Luke said. “You can save her.”

Annabeth made a weak sound of protest. My heart felt like it was being twisted into a knot. I wanted to run to her, but I couldn’t move.

“Free my hands,” Artemis said.

Luke brought out his sword, Backbiter. With one expert strike, he broke the goddess’s handcuffs.

Artemis ran to Annabeth and took the burden from her shoulders. Annabeth collapsed on the ground and lay there shivering. Artemis staggered, trying to support the weight of the black rocks.

The man in the shadows chuckled. “You are as predictable as you were easy to beat, Artemis.”

“You surprised me,” the goddess said, straining under her burden. “It will not happen again.”

“Indeed it will not,” the man said. “Now you are out of the way for good! I knew you could not resist helping a young maiden. That is, after all, your specialty, my dear.”

Artemis groaned. “You know nothing of mercy, you swine.”

“On that,” the man said, “we can agree. Luke, you may kill the girl now.”

“No!” Artemis shouted.

Luke hesitated. “She—she may yet be useful, sir. Further bait.”

“Bah! You truly believe that?”

“Yes, General. They will come for her. I’m sure.”

The man considered. “Then the dracaenae can guard her here. Assuming she does not die from her injuries, you may keep her alive until winter solstice. After that, if our sacrifice goes as planned, her life will be meaningless. The lives of all mortals will be meaningless.”

Luke gathered up Annabeth’s listless body and carried her away from the goddess.

“You will never find the monster you seek,” Artemis said. “Your plan will fail.”

“How little you know, my young goddess,” the man in the shadows said. “Even now, your darling attendants begin their quest to find you. They shall play directly into my hands. Now, if you’ll excuse us, we have a long journey to make. We must greet your Hunters and make sure their quest is . . . challenging.”

The man’s laughter echoed in the darkness, shaking the ground until it seemed the whole cavern ceiling would collapse.

I woke with a start. I was sure I’d heard a loud banging. I looked around the cabin. It was dark outside. The salt spring still gurgled. No other sounds but the hoot of an owl in the woods and the distant surf on the beach. In the moonlight, on my nightstand, was Annabeth’s New York Yankees cap. I stared at it for a second, and then: BANG. BANG.

Someone, or something, was pounding on my door.

I grabbed Riptide and got out of bed.

“Hello?” I called.

THUMP. THUMP.

I crept to the door.

I uncapped the blade, flung open the door, and found myself face-to-face with a black pegasus.

Whoa, boss! Its voice spoke in my mind as it clopped away from the sword blade. I don’t wanna be a horse-ke-bob!

Its black wings spread in alarm, and the wind buffeted me back a step.

“Blackjack,” I said, relieved but a little irritated. “It’s the middle of the night!”

Blackjack huffed. Ain’t either, boss. It’s five in the morning. What you still sleeping for?

“How many times have I told you? Don’t call me boss.”

Whatever you say, boss. You’re the man. You’re my number one.

I rubbed the sleep out of my eyes and tried not to let the pegasus read my thoughts. That’s the problem with being Poseidon’s son: since he created horses out of sea foam, I can understand most equestrian animals, but they can understand me, too. Sometimes, like in Blackjack’s case, they kind of adopt me.

See, Blackjack had been a captive on board Luke’s ship last summer, until we’d caused a little distraction that allowed him to escape. I’d really had very little to do with it, seriously, but Blackjack credited me with saving him.

“Blackjack,” I said, “you’re supposed to stay in the stables.”

Meh, the stables. You see Chiron staying in the stables?

“Well . . . no.”

Exactly. Listen, we got another little sea friend needs your help.

“Again?”

Yeah. I told the hippocampi I’d come get you.

I groaned. Anytime I was anywhere near the beach, the hippocampi would ask me to help them with their problems. And they had a lot of problems. Beached whales, porpoises caught in fishing nets, mermaids with hangnails— they’d call me to come underwater and help.

“All right,” I said. “I’m coming.”

You’re the best, boss.

“And don’t call me boss!”

Blackjack whinnied softly. It might’ve been a laugh.

I looked back at my comfortable bed. My bronze shield still hung on the wall, dented and unusable. And on my nightstand was Annabeth’s magic Yankees cap. On an impulse, I stuck the cap in my pocket. I guess I had a feeling, even then, that I wasn’t coming back to my cabin for a long, long time.

EIGHT

I MAKE A DANGEROUS PROMISE