There was no whine of generators spinning up, no vibration from powerful machinery. Just the low background hum of electrical gadgetry in the cramped, round-ceilinged little shelter. The five of them had taken off their helmets; there'd been no time to get out of the suits entirely. Nor any inclination to do so.

Two red lights suddenly glowered at Wicksen. "Main buss has cut out," he said, tension edging into his voice.

"On it," said the only woman among his assistants. I'll have to run a diagnostic."

"No time. Go to the backup."

"Right."

The red lights remained, but a new pair of greens lit up. Wicksen glanced at the countdown clock: fourteen minutes remaining until impact.

"How's the pointing system?" he asked.

"It's tracking okay. Hardly any movement, the bird's coming right down our throats."

"Makes life simpler," Wicksen murmured.

"Magnets are at full power."

He nodded, blew out a breath through puffed cheeks, then leaned his right index finger on the firing button.

A multitude of red lights sprang up on the board.

"What the hell?"

"Main buss shorted out!" the woman shouted. "Backup's malfunctioned!"

Wicksen swore under his breath. Murphy's law. Turning toward her, he saw that her face look agonized.

"What's the problem?" he asked calmly. Twelve minutes to impact.

"I don't know," she said, voice jittery, as she stared at the instruments in front of her.

Three minutes later Wicksen had satisfied himself that the main buss itself was functioning properly.

"It's the wiring," he said, reaching for his helmet. "The connections must have come loose."

"That can't be!" said the man who had done the wiring job.

"Can't be anything else," said Wicksen simply, as he pulled his helmet over his head.

"You're not going out there! With the nuke less than ten minutes from detonation!"

"Somebody's got to."

"Let me," said the man who had done the wiring. "It's my responsibility."

"We'll both go," said Wicksen.

Colonel Giap had taken the precaution of having the seven suicide volunteers placed in the same tractor with him. He wanted them under his eye; he was not willing to take chances that such fanatics might strike off on their own once the action started.

The American woman especially intrigued him. She was not young, and she certainly did not seem fanatical. Giap wondered what could have happened in her life to make her want to embrace death.

So he asked her. There was scarcely any privacy in the tractor, crowded with troops and the seven volunteers, all in spacesuits, but once they were safely parked in the lee of Alphonsus's ringwall mountains, Giap clambered down onto the dusty regolith soil for a quick inspection of his vehicles.

Once satisfied that all the vehicles were properly positioned and there were no problems with the troops—except the usual complaints of soldiers everywhere—he returned to his own tractor. Instead of re-entering it, however, he ordered the American woman outside.