ENTRAPPED ₂

40

ARION RACED OVER THE WATER AT THE SPEED OF SOUND, HEATING THE AIR AROUND THEM SO THAT MADELEINE NO LONGER FELT THE COLD. She was grateful for the fast ride, but that was about all she was grateful for. Behind Frank, her teeth were clenched and her eyes were bouncing in her head. She could feel Percy slipping away from her, and she had to keep pulling him back up.

They raced through icy straits, past blue fjords and cliffs with waterfalls spilling into the sea. Arion jumped over a breaching humpback whale and kept galloping, startling a pack of seals off an iceberg.

It seemed like only minutes before they zipped into a narrow bay. The water turned the consistency of shaved ice in blue sticky syrup. Arion came to a halt on a frozen turquoise slab.

A half a mile away stood Hubbard Glacier. Purple snowcapped mountains marched off in either direction, with clouds floating around their middles. In a massive valley between two of the largest peaks, a ragged wall of ice rose out of the sea, filling the entire gorge. The glacier was blue and white with streaks of black, so that it looked like a hedge of dirty snow left behind on a sidewalk after a snowplow had gone by, only four million times as large.

As soon as Arion stopped, Madeleine felt the temperature drop. All that ice was sending off waves of cold, turning the bay into the world's largest refrigerator. The eeriest thing was a sound like thunder that rolled across the water.

"What is that?" Frank gazed at the clouds above the glacier. "A storm?"

"No," Hazel said. "Ice cracking and shifting. Millions of tons of ice."

"You mean that thing is breaking up?" Frank asked.

As if on cue, a sheet of ice silently calved off the side of the glacier and crashed into the sea, spraying water and frozen shrapnel several stories high. A millisecond later and the sound hit them, a BOOM almost as jarring as Arion hitting the sound barrier.

"We can't get close to that thing!" Frank said.

"We have to," Percy said. "The giant is at the top."

Arion nickered.

"Jeez, Hazel," Percy said, "tell your horse to watch his language."

Hazel stifled a laugh. "What did he say?"

"With the cussing removed? He said he can get us to the top."

Frank looked incredulous. "I thought the horse couldn't fly!"

This time Arion whinnied so angrily, Madeleine didn't need Percy to know that he was cursing.

"Dude," Percy told the horse, "I've gotten suspended for saying less than that. Hazel, he promises you'll see what he can do as soon as you give the word."

"Um, hold on, then, you guys," Hazel said nervously. "Arion, giddyup!"

Arion shot toward the glacier like a runaway rocket, barreling straight across the slush like he wanted to play chicken with the mountain of ice.

The air grew colder. The crackling of the ice grew louder. As Arion closed the distance, the glacier loomed so large, Madeleine got vertigo just trying to take it all in. The side was riddled with crevices and caves, spiked with jagged ridges like ax blades. Pieces were constantly crumbling off―some no larger than snowballs, some the size of houses.

When they were about fifty yards from the base, a thunderclap rattled Madeleine's bones, and a curtain of ice that would have covered Camp Jupiter calved away and fell toward them.

"Look out!" Frank shouted.

Arion was already ahead of him. In a burst of speed, the horse zig-zagged through the debris, leaping over chunks of ice and clambering up the face of the glacier.