HAYDEN GRIFFIN WAS plucking a fish when the gravity bell rang. The dull clang penetrated even the thick wooden walls of the corporation inn; it was designed to be heard all over town. Hayden paused, frowned, and experimentally let go of the fish. Four tumbling feathers flashed like candle flames in an errant beam of sunlight shooting between the floorboards. The fish landed three feet to his left. Hayden watched the feathers dip in a slow arc to settle next to it.

"A bit early for a spin-up, ain't it?" said Hayden. Miles grunted distractedly. The former soldier, now corporation cook, was busily pouring sauce over a steaming turkey that he'd just rescued from the oven's minor inferno. His bald skull shone in the firelight. "They might need me all the same," continued Hayden. "I better go see."

Miles glanced up. "Your ma left you here," he said. "You been bad again. Pick up the fish."

Hayden leaned back against the table, crossing his arms. He was trying to come up with a reply that didn't sound like whining when the bell rang again, more urgently. "See?" he said. "They need somebody. Nobody in town's as good with the bikes as I am. Anyway, how you gonna boil this fish if the gravity goes?"

"Gravity ain't gonna go, boy," snapped Miles. "It's solid right now."

"Then I better go see what else is up."

"You just want to watch your old lady light the sun," said Miles.

"Don't you?"

"Today's just a test. I'll wait for tomorrow, when they light it for real."

"Come on, Miles. I'll be right back."

The cook sighed. "Go, then. Set the bikes going. Then come right back." Hayden bolted for the door and Miles shouted, "Don't leave that fish on the floor!"

As Hayden walked down the hall to the front of the inn another stray beam of sunlight spiked up around the plank floorboards. That was a bad sign; Mom would have to wait for deep cloud cover before lighting the town's new sun, lest the Slipstreamers should see it. Slipstream would never tolerate another sun so close to their own. The project was secret—or it had been. By tomorrow the whole world would know about it.

Hayden walked backward past the well-polished oak bar, waving his lanky arms casually at his side as he said, "Bell rang. Gotta check the bikes." One of the customers smirked doubtfully at him; Mama Fifty glared at him from her post behind the bar. Before she could reply he was out the front door.

A blustery wind was blowing out here as always, even whistling up between the street boards. Sunlight angled around the edges of the street's peaked roof, bars and rectangles of light sliding along the planking and up the walls of the buildings that crammed every available space. The street boards gave like springs under Hayden's feet as he ran up the steep curve of the avenue, which was nearly empty at this time of day.

Gavin Town came to life at dusk, when the workers who slept here flooded back from all six directions, laughing and gossiping. Merchants would unshutter their windows for the night market as the gaslights were lit all along the way. The dance hall would throw open its doors for those with the stamina to take a few turns on the floor. Sometimes Hayden picked up some extra bills by lighting the streetlights himself. He was good with fire, after all.

If he went to work on the bikes Hayden wouldn't be able to see the sun, so he took a detour. Slipping down a narrow alleyway between two tall houses, he came to one of the two outer streets of the town—really little more than a narrow covered walkway. Extensions of houses and shops formed a ceiling, their entrances to the left as he stepped into the way. To the right was an uneven board fence, just a crack open at the top. An occasional shuttered window interrupted the surface of the fence, but Hayden didn't pause at any of them. He was making for an open gallery a quarter of the way up the street.

At moments like this—alone and busy—he either completely forgot himself or drowned in grief. His father's death still weighed on him, though it had been a year now; was it that long since he and his mother had moved here? Mother kept insisting that it was best this way, that if they'd stayed home in Twenty-two Town they would have been surrounded by reminders of Dad all the time. But was that so bad?

His father wouldn't be here to see the lighting of the sun, his wife's completion of his project—their crowning achievement as a family. When Hayden remembered them talking about mat, it was his father's voice he remembered, soaring in tones of enthusiasm and hope. Mother would be quieter, but her pride and love came through in the murmurs that came through the bedroom wall and lulled Hayden to sleep at night. To make your own sun! That was how nations were founded. To light a sun was to be remembered forever.

WHEN HAYDEN WAS twelve his parents had taken him on his first visit to Rush. He had complained, because lately he'd come to know that though Slipstream was a great nation, it was not his nation. His friends had jeered at him for visiting the camp of the enemy, though he didn't exactly know why Slipstreamers were bad, or what it meant to be a citizen of Aerie instead.

"That's why we're going," his father had said. "So that you can understand."

"That, and to see what they're wearing in the principalities," said Mother with a grin. Father had glowered at her—an expression his slablike face seemed designed for—but she ignored him.

"You'll love it," she said to Hayden. "We'll bring back stuff to make those pals of yours completely envious."

He'd liked that thought; still, Father's words had stuck with him. He was going to Rush to understand.

And he thought he did understand, the moment that their ship had broached the final wall of cloud and he glimpsed the city for the first time. As light welled up, Hayden flew to a stoutly-barred window with some other kids—there was no centrifuge in this little ship, so everybody was weightless—and shielded his eyes to look at their destination.

The nearby air was full of travelers, some riding bikes, some on prop-driven contraptions powered by pedals, and some kicking their feet to flap huge white wings strapped to their backs. They carried parcels, towed cargos, and in the case of the fan-jets, left behind slowly fading arcs and lines of white contrail to match the sky.

Their cylindrical frigate had emerged from the clouds near Slip-stream's sun, which it made an inferno of half the sky. Seconds out of the mist and the temperature was already rising in the normally chilly ship's lounge. The other boys were pointing at something and shouting excitedly; Hayden peered in that direction, trying to make out what was casting a seemingly impossible shadow across an entire half of the view. The vast shape was irregular like any of the rocks they had passed on their way here. Where those rocks were usually house-sized and sprouted spidery trees in all directions, this shape was blued with distance and covered with an even carpet of green. It took Hayden a few seconds to realize that it really was a rock, but one that was several miles in diameter.

He gaped at it. Father laughed from the dining basket, woven of wicker, where he perched with Mother. "That's the biggest thing you've ever seen, Hayden. But listen, there's much bigger places. Slipstream is not a major state. Remember mat."

"Is that Rush?" Hayden pointed.

Father pulled himself out of the basket and came over. With his broad laborer's shoulders and calloused hands, he bulked much bigger than the kids, who made a place for him next to Hayden. "The asteroid? That's not Rush. It's the source of Slipstream's wealth, though—it and their sun." He leaned on the rail and pointed. "No… That is Rush."