second, louder rumble shook the ground under their feet. "Get out of here!" shouted Ripred. Everything fell into confusion as they tried to mount the bats. They had changed riders so many times during the trip that no one was sure where their designated seat was. Gregor grabbed Boots and jumped on Ares, only to remember that no other bat could carry Ripred. He slid off and slipped on a battery, which was lucky, because it reminded him to scoop all the stuff he had dumped out earlier into his backpack and sling it over his shoulder. By that time, Boots had run off and had climbed on Temp's back.

"Stop!" called out Ares. "Luxa, Hazard, Gregor, and Boots on Aurora. Howard, Temp, and Cartesian on Nike. Thalia, fly under me in case you tire." He assumed the takeoff position and said to Ripred, "Let us go."

Everyone stumbled around but by following Ares's directions managed to get a seat. Gregor ended up at the front of the bat with Boots hugging him around his neck. Hazard and Luxa swung up behind them.

The second the bats left the cave they were swept up in the strong current that was blowing in from a cave overhead. It was the same current that had cleared away the ashen air and assured that the poisonous gas did not drift their way. Now it was carrying them directly toward the glowing volcano.

Gregor was afraid the bats were going to flip out again, but they were doing all right. It was not one current that overwhelmed them but the convergence of multiple airstreams that had occurred earlier. Almost immediately he felt Aurora turn away from the volcano and begin to head into the wind. It was so strong, they made little forward motion. He wrapped his arms around Boots, trying to block as much of it as possible. Switching tactics, all the bats suddenly whipped back around and flew straight for the volcano. At first it seemed insane, but then Gregor realized that the only way they could get away from the volcano was by riding the current that blew right over it.

Between the force of the wind and the bats' own wing power, they were moving through space at an incredible velocity. The volcano, which had been a distant vision, quickly rose up in front of them.

Gregor was awestruck by the "queen." She was majestic and imposing but most of all furious. Clouds of steam hissed from fissures in her sides. Molten lava oozed out of her top and flowed downward in fiery streams. Even with the wind whistling in his ears, Gregor could hear her rumbling growing into a roar.

As they flew out over the volcano, Gregor could see the bubbling lake of lava brewing inside. The air seared his lungs. Everything was suffused with a hot red light, including the pit where the dead mice lay. Gregor pressed his cheek against Boots's so she couldn't turn her head in the direction of the mice. But he forced himself to look at the bodies, to keep the image clear and alive in his brain. He knew he had to be able to tell their story, and tell it as fully as he could, when he returned to Regalia. He had to be able to impress upon people the magnitude of what had happened. Was happening. So much counted on it. Gregor began to feel dizzy. Some of the fumes rising out of the volcano must be riding along the current with them. He knew the fumes must be affecting the bats as well, but none of them showed any sign of slowing. They left the volcano behind as quickly as they had approached it.

Another ominous rumble rattled the earth below them. Gregor was feeling sicker, not better, as they flew on. What if they were just riding along in a pocket of poisonous gas and it was only a matter of time before they were overcome? He tightened his hold on Boots.

"You okay, Boots?" he hollered over the wind.

"I sleepy," she said. "I take a nap."

"Oh, no. No naps!" shouted Gregor, alarm shooting through him. "You stay awake, okay?"

"Okay," said Boots faintly, but he could feel her trying to nestle up against him.

"A tunnel! Find a tunnel!" he heard Ripred shout.

They were approaching a giant stone wall that signaled the far end of the cavern. The bats began to dodge in and out of openings on the wall, trying to judge what was merely a cave and what might be a tunnel and a means of escape. Above him Gregor saw Nike begin to circle at an opening. Howard was waving his arms wildly for them to follow. Aurora made straight for the tunnel. Nike disappeared inside it first, followed by Ares, who now had Thalia locked in his claws. Aurora brought up the rear.

Gregor immediately felt safer when they entered the tunnel. The air was still nasty, but at least they were out of the volcano's reach. He relaxed his grip on Boots a little and was just turning to check on Luxa and Hazard when the "queen" erupted.

Nothing else could account for the deafening explosion, which rattled his teeth, sent flares of color shooting before his eyes, and left him unable to hear anything but a shrill ringing in his ears.

A blast of hot air hit them and then there was no air, only a stinging cloud of ash and dust that blocked out everything else. He struggled to breathe, to see, thought he must pull Boots's T-shirt up over her face to protect her. He could feel himself losing consciousness and felt Luxa's grip on his shoulder loosening. "No," he wanted to cry out. "Hold on! Hold on! Boots!" That was the last thing he remembered....

When he came to, Gregor was lying facedown on what felt like a large rock. His chin hung off a sharp ledge. He began coughing immediately. As he sat up he could feel the ash falling from his body, sending up a cloud, making it even harder to breathe. He staggered forward a few steps and fell off the rock hard, landing in at least four feet of ash. Struggling back to his feet, he began to wade through the stuff, waving his hands blindly in front of him. His head pounded so badly, he thought the pain might actually split it in two. Making it to a wall, he braced himself and vomited until nothing but bile came from his stomach. Trembling and disoriented, he leaned against the wall and tried to clear his thoughts.

"What happened?" he thought. He remembered the volcano... flying... a vision of the mice glowing in the red light... light... he needed light....

Gregor fumbled for the flashlight at his belt and found the switch. At first he thought it was broken. Then he realized the plastic face was obscured by ash. He knocked the flashlight against the wall and wiped it as best as he could on the inside of his shirt.

The light revealed a large tunnel blanketed in gray dust. It had drifted into deep banks like snow in places. In others, just a fine layer covered the floor. Gregor waded to a relatively clear spot to try to get his bearings. He must have passed out and slipped off Aurora's back at some point. But then where was Boots? She had been in his arms. Where were Luxa and Hazard? Where were the others?

"Where are the others?" Gregor remembered Cartesian's panicked cry. "Where are the others?"

Gregor plowed back to the rock, dragging his feet through the ash, trying to locate anyone else who might have fallen with him. By the time he had covered the area, he was choking on a cloud of dust but had discovered no one. He started down the tunnel in the direction his head had been pointing when he awoke, hoping that he might find the rest of the party ahead.

The smooth surface of the ash was unbroken by footprints. It muffled his footsteps, making them barely audible to his still ringing ears. He had never felt so alone in his life. Never had been, probably. There was no sign of life anywhere. It was a miracle he was even alive, that he had not suffocated in the eruption. Probably he would have if his chin hadn't been hanging off the rock. If he'd landed on the ground, most likely he'd have been buried alive and died under the ash.

"Where are the others? Where are the others?" Cartesian's voice screamed in Gregor's brain.

What if none of them had survived? What if they had all fallen unconscious to the tunnel floor? Maybe he was passing by them as he shuffled along, unaware of their bodies under...

Gregor stopped and pressed his palms against his eyes. "Don't. Don't think like that. Just keep walking. You just keep walking."

It was impossible to gauge how much time was passing. The tunnel remained unchanged. His breath came in short ragged gasps. Every inch of him, inside and out, seemed coated in a layer of ash.

He remembered the water in his backpack and popped it open. The first mouthful he just swished around his mouth, rinsing the grit from his teeth, and spat on the floor. Then he took a long, deep drink, not bothering to ration it. Feeling slightly better, he trudged on.

At some point, he became aware of a faint breeze on his face. "Another current," he thought, and wondered if he should try to take cover behind a rock. But the breeze remained gentle and carried air that was definitely sweeter than what he'd been breathing. It eased the pain in his chest and the ache in his temples.

He thought the twinkle of light in the distance was only a reflection of his own light. But when he directed his beam to the ground, he could still see it there. He moved faster, causing more dust to rise. "Hey!" he tried to call. "Hey!" But he couldn't even hear his own voice.

Then he could make out a figure, as ghostly and gray as his surroundings. He caught glimpses of the light again, brighter now. Gregor broke into a run, more like a clumsy gallop really, because his knee had been damaged when he stepped off the rock.

"Hey!" he called again, and this time he heard himself and the figure turned.

Gregor stopped short. One look at Howard's face confirmed what Gregor had been dreading. Someone was dead.

"Who is it?" said Gregor, his heart slamming against his chest. "Not Boots?"

Howard stepped aside, squinting at the gray figures before him. Boots was all right. She was sitting on Temp's back, holding her scepter with its tiny light. At first glance, everyone looked all right. Ripred, Cartesian, Luxa, Hazard, the cluster of four bats. But he had miscounted. Only three bats huddled together. Lying on the floor, almost obscured by the dust, her head cradled in Hazard's lap, was Thalia.