There was a Federation colony on the second planet out from the primary. Established thirty-five years earlier by a militant Moslem faction, and backed by a consortium of high-tech companies eager to show off their world-conquering equipment, the colony had been threatening secession for nearly half its existence. Now, it seemed to mean business.

The colonists had begun to set up a blockade, positioning their ships around the system's perimeter. They might just be strong enough to make the blockade work, but only if they were given the time necessary to get a sufficient number of ships into space and positioned around the system before the Federation Fleet arrived.

Defiant's captain had been killed in the first skirmish as the Federation Fleet ship entered the system. At that time a call for assistance had been sent out by hyperspace radio.

Now Susan was in command, and the hard decisions of battle were totally hers to make. Should she give the order to go in before the colonists could complete their blockade and close off the system, running the blockade alone and risking the lives of Defiant's three hundred plus crew? Or should she wait for the Federation Fleet ships she knew were even now making their twisted way through hyperspace to bring aid-perhaps too late?

She decided not to wait. She was determined to take Defiant in alone. When she told Karl of her decision, he tried to dissuade her.

They were in Susan's cabin, laying together in her zero-gravity hammock, trying to snatch a few private moments before beginning the battle to which she had already committed them. They had just made love, and that familiar glow of satiation was still with her.

"You're making a mistake," Karl said as he held Susan close, "a horrible mistake."

"Are you talking as a ship's officer?"

"No. Nothing so official as that. But it's a mistake, all-the-same."

"Something has to be done," she said, then kissed him tenderly on the neck, breathing in his heady man-smell. "And there's no one else here to do it."

Karl crawled out of the hammock and hung weightless before her. "It's too great a gamble," he said, "especially with this ship. Its crew is untried, made up of little more than children. And you will be sending most of them to a certain death."

"Then you think I should wait? You think I should allow those colonists down there the time they need to finish their blockade?"

"You've called for help. A Fleet task force will be in-system soon enough."

"I'm sorry, Karl," she said, "I can't wait. It will be too late by the time Fleet arrives. These colonists are too strong, and too determined."

"Then it'll be on your head." He turned and kicked off against the bulkhead. Floating to his clothing, he steadied himself with an arm through an anchoring ring and silently got dressed. Without another word he floated from the cabin.

After a few minutes Susan got up and got dressed as well. She went into battle with Karl's words burning in her mind.

"Ten minutes to docking," came the floater pilot's voice from a speaker in the passenger compartment's overhead. "Passengers will please prepare to disembark."

Susan blinked her eyes open. The mining camp stood out on the screen. The floater was passing within a quarter mile of the oldest still-functioning facility on Luna, its route taking it past on slightly higher ground.

The camp's layout should have been bathed in too-white, artificial light. Instead, it was dark. Yet in the dim starlight and the soft glow from the near-full Earth, she could just make out the camp's major structures.

In the foreground were the miners' quarters, little more than an air-tight Quonset hut covered over with lunar soil. Three large, rectangular pits filled the majority of the camera's field of view. She knew at the bottom of each a yellow- painted scooper should have been working, an occasional puff of water vapor turned ice cloud its only exhaust. Yet they were not there. The nuclear power plant, a large dome-shaped structure, stood several hundred yards to the right of and beyond the living quarters. It, too, sat darkened on the cratered plain.

That reactor was more important now than it had ever been in the past. It not only supplied power to the mining camp, but supplemented Luna City's power resources as well. Three months ago, when the city's solar power satellite was destroyed by a faction opposed to lunar independence, the city had to again rely on nuclear power. And Luna City had grown too large in the past several years for its own antiquated nuclear power plant to be sufficient.

But why was it all dark now? Why couldn't she see the activity she knew should be going on?

To the right of the reactor dome the mass-driver's dual track stretched off into the distance, barely discernable in the darkness. Susan imagined its buckets flashing down the track, accelerating packets of lunar material to escape velocity for their two day journey to the catcher forty thousand miles above the moon's far side. She should see it happening before her-the spots of light that were the packets flashing down the mass-driver's track at the rate of one each second. But she did not. For some reason, it was not in operation.

The mass-driver had launched its payloads nearly continuously since it had been opened almost one hundred fifty years ago. Only twice in all that time had it been shut down for maintenance, and both times it had been for less than a month.

But if it had been shut down, she would have heard about it. It was a rare enough occurrence that it would have made the holo-vid broadcasts on Earth. And she would certainly see a repair crew working on it now.

She would find out when she got to Luna City, she thought. The mining camp was only thirty miles from the city. She squinted at her wrist chronometer in the dim cabin light. It read 10:47. She had slept through the majority of the trip.

The floater banked to port. On her viewscreen she noticed a barely discernible spot of light ahead and to the left, bobbing frantically.

At first she thought it was her imagination, but as she squinted and strained she thought she could make out a human figure atop a low hill, silhouetted against the star field. Someone was out there, walking the lunar surface. Probably a miner from the camp. Or a member of the mass-driver's maintenance crew.

The floater descended into a narrow canyon, and the spot of light disappeared. The nightmare's remnants rushed in to fill her thoughts.

It had come again as she slept, sharp and clear after all the years, unlike most dreams that possessed a quality of the unreal.

She forced that thought from her mind, then scanned the passengers, again wondering if someone onboard might actually have orders to kill her. If so, which one? From what quarter would the next attack come?

"Five minutes to docking," the overhead speaker squawked.

Now she could see the glowing dome-shape of Luna City on her screen, an almost surrealistic apparition. She was nearly there, nearly to her new assignment. Then the floater banked hard to the left, and the dome was blocked from the camera's field of view by the bulk of the floater itself.

What is this assignment for Survey Service? she wondered. Renford had said he didn't know, and Susan believed him. As far as she knew, he had never lied to her. But there was security around this thicker than methane around Jupiter.

"Docking in one minute."

What could it possibly be? What was so important that Hyatt could not permit even Renford to know the details?

"Docking in five seconds. Four…three…two…one…" A shudder ran through the floater's structure. "Docking complete."

Susan hung quietly in her webbing while those around her busied themselves with unstrapping, gathering their belongings, and shuffling toward the hatch in the forward bulkhead. They talked loudly of the fun they would have on furlough, more softly of their temporary assignments to Survey Service. Only the civilians remained silent.