The Mark of Athena

didn’t help him move as it usually did. In fact, it seemed to be pushing him back. He dropped Riptide and used both arms.

Coach Hedge and Keto were five feet from the exit.

In desperation, Percy scooped up a giant marble and hurled it underhanded like a bowling ball.

It hit the glass with a thunk—not nearly loud enough to attract attention.

Percy’s heart sank.

But Coach Hedge had the ears of a satyr. He glanced over his shoulder. When he saw Percy, his expression went through several changes in a matter of microseconds—incomprehension, surprise, outrage, then a mask of calm.

Before Keto could notice, Hedge pointed toward the top of the amphitheater. It looked like he might be screaming, Gods of Olympus, what is that?

Keto turned. Coach Hedge promptly took off his fake foot and ninja-kicked her in the back of the head with his goat hoof. Keto crumpled to the floor.

Percy winced. His own recently whopped head throbbed in sympathy, but he had never been happier to have a chaperone who liked mixed martial arts cage matches.

Hedge ran to the glass. He held up his palms like: What are you doing in there, Jackson?

Percy pounded his fist on the glass and mouthed: Break it!

Hedge yelled a question that might have been: Where’s Frank?

Percy pointed at the giant koi.

Frank waved his left dorsal fin. ’Sup?

Behind Hedge, the sea goddess began to move. Percy pointed frantically.

Hedge shook his leg like he was warming up his kicking hoof, but Percy waved his arms, No. They couldn’t keep whopping Keto on the head forever. Since she was immortal, she wouldn’t stay down, and it wouldn’t get them out of this tank. It was only a matter of time before Phorcys came back to check on them.

On three, Percy mouthed, holding up three fingers and then gesturing at the glass. All of us hit it at the same time.

Percy had never been good at charades, but Hedge nodded like he understood. Hitting things was a language the satyr knew well.

Percy hefted another giant marble. Frank, we’ll need you too. Can you change form yet?

Maybe back to human.

Human is fine! Just hold your breath. If this works…

Keto rose to her knees. No time to waste.

Percy counted on his fingers. One, two, three!

Frank turned to human and shoved his shoulder against the glass. The coach did a Chuck Norris roundhouse kick with his hoof. Percy used all his strength to slam the marble into the wall, but he did more than that. He called on the water to obey him, and this time he refused to take no for an answer. He felt all the pent-up pressure inside the tank, and he put it to use. Water liked to be free. Given time, water could overcome any barrier, and it hated to be trapped, just like Percy. He thought about getting back to Annabeth. He thought about destroying this horrible prison for sea creatures. He thought about shoving Phorcys’s microphone down his ugly throat. Fifty thousand gallons of water responded to his anger.

The glass wall cracked. Fracture lines zigzagged from the point of impact, and suddenly the tank burst. Percy was sucked out in a torrent of water. He tumbled across the amphitheater floor with Frank, some large marbles, and a clump of plastic seaweed. Keto was just getting to her feet when the diver statue slammed into her like it wanted a hug.

Coach Hedge spit salt water. “Pan’s pipes, Jackson! What were you doing in there?”

“Phorcys!” Percy spluttered. “Trap! Run!”

Alarms blared as they fled the exhibits. They ran past the Nereids’ tank, then the telkhines. Percy wanted to free them, but how? They were drugged and sluggish, and they were sea creatures. They wouldn’t survive unless he found a way to transport them to the ocean.

Besides, if Phorcys caught them, Percy was pretty sure the sea god’s power would overcome his. And Keto would be after them too, ready to feed them to her sea monsters.

I’ll be back, Percy promised, but if the creatures in the exhibits could hear him, they gave no sign.

Over the sound system, Phorcys’s voice boomed: “Percy Jackson!”

Flash pots and sparklers exploded randomly. Donut-scented smoke filled the halls. Dramatic music—five or six different tracks—blared simultaneously from the speakers. Lights popped and caught fire as all the special effects in the building were triggered at once.

Percy, Coach Hedge, and Frank stumbled out of the glass tunnel and found themselves back in the whale shark room. The mortal section of the aquarium was filled with screaming crowds—families and day camp groups running in every direction while the staff raced around frantically, trying to assure everyone it was just a faulty alarm system.

Percy knew better. He and his friends joined the mortals and ran for the exit.