Barrent didn't answer.

"Do you understand?" the priest asked more sharply.

"Eh?" Barrent said. He had been dozing with his eyes open. He forced himself awake and managed to say, "Yes, Uncle, I understand."

"Excellent. Understanding that, we ask, why did The Black One allow even the illusion of Good to exist in an Evil universe? And the answer is found in the Law of Necessary Opposites; for Evil could not be recognized as such without something to contrast it with. The best contrast is an opposite. And the opposite of Evil is Good." The priest smiled triumphantly. "It's so simple and clear-cut, isn't it?"

"It certainly is, Uncle," Barrent said. "Would you like a little more wine?"

"Just the tiniest drop," the priest said.

He talked to Barrent for another ten minutes about the natural and charming Evil inherent in the beasts of the field and forest, and counseled Barrent to pattern his behavior on those simple-minded creatures. At last he rose to leave.

"I'm very glad we could have this little chat," the priest said, warmly shaking Barrent's hand. "Can I count on your appearance at our Monday night services?"

"Services?"

"Of course," Uncle Ingemar said. "Every Monday night — at midnight — we hold Black Mass at the Wee Coven on Kirkwood Drive. After services, the Ladies Auxiliary usually puts out a snack, and we have community dancing and choir singing. It's all very jolly." He smiled broadly. "You see, the worship of evil can be fun."

"I'm sure it can," Barrent said. "I'll be there, Uncle."

He showed the priest to the door. After locking up, he thought carefully about what Uncle Ingemar had said. No doubt about it, attendance at services was necessary. Compulsory, in fact. He just hoped that the Black Mass wouldn't be as infernally dull as Ingemar's exposition of Evil.

That was Friday. Barrent was kept busy over the next two days. He received a shipment of homeopathic herbs and roots from his agent in the Bloodpit district. It took the better part of a day to sort and classify them, and another day to store them in the proper jars.

On Monday, returning to his shop after lunch, Barrent thought he saw the girl. He hurried after her, but lost her in the crowd.

When he got back to his store, Barrent found that a letter had been slipped under his door. It was an invitation from his neighborhood Dream Shop. The letter read:

Barrent put down the letter. He had no idea what a Dream Shop was, or how the dreams were produced. He would have to find out. Even though the invitation was graciously worded, it had a peremptory tone to it. Past a doubt, a visit to a Dream Shop was one of the obligations of a Free Citizen.

But of course, an obligation could be a pleasure, too. The Dream Shop sounded interesting. And a genuine memory-resurrection dream of Earth would be worth almost any price the proprietors wished to ask.

But that would have to wait. Tonight was Black Mass, and his attendance there was definitely required.

Barrent left his store at eleven o'clock in the evening. He wanted time for a stroll around Tetrahyde before going to the service, which began at midnight.

He started his walk with a definite sense of well-being. And yet, because of the irrational and unexpecting nature of Omega, he almost died before reaching the Wee Coven on Kirkwood Drive.

It had turned into a hot, almost suffocatingly humid night when Barrent began his walk. Not the faintest breath of air stirred along the darkened streets. Although he was wearing only a black mesh shirt, shorts, gunbelt, and sandals, Barrent felt as if he were wrapped in a thick blanket. Most of the people of Tetrahyde, except for those already at the Covens, had retired to the coolness of their cellars. The dark streets were nearly deserted.

Barrent walked on, more slowly. The few people he met were running to their homes. There was a sense of panic in that silent, dogged sprint through heat which made walking difficult. Barrent tried to find out what the matter was, but no one would stop. One old man shouted over his shoulder, "Get off the street, idiot!"

"Why?" Barrent asked him.

The old man snarled something unintelligible and hurried on.

Barrent kept on walking, nervously fingering the butt of his needlebeam. Something was certainly wrong, but he had no idea what it was. His nearest shelter now was the Wee Coven, about half a mile away. It seemed best to keep on moving in that direction, staying alert, waiting to see what was wrong.

In a few minutes, Barrent was alone in a tightly shuttered city. He moved into the center of the street, loosened the needlebeam in its holster, and prepared for attack from any side. Perhaps this was some special holiday like Landing Day. Perhaps Free Citizens were fair game tonight. Anything seemed possible on a planet like Omega.

He thought he was ready for any possibility. But when the attack came, it was from an unexpected quarter.

A faint breeze stirred the stagnant air. It faded and returned, stronger this time, perceptibly cooling the hot streets. Wind rolled off the mountains of the interior and swept through the streets of Tetrahyde, and Barrent could feel the perspiration on his chest and back begin to dry.

For a few minutes, the climate of Tetrahyde was as pleasant as anything he could imagine.

Then the temperature continued to fall.

It dropped rapidly. Frigid air swept in from the distant mountain slopes, and the temperature fell through the seventies into the sixties.

This is ridiculous, Barrent thought to himself. I'd better get to the Coven.

He walked more rapidly, while the temperature plummeted. It passed through the forties into the low thirties. The first glittering signs of frost appeared on the streets.

It can't go much lower, Barrent thought.

But it could. An angry winter wind blew through the streets, and the temperature dropped into the twenties. Moisture in the air began forming into sleet.

Chilled to the bone, Barrent ran down the empty streets, and the wind, rising to gale force, pulled and tugged at him. The streets glittered with ice, making the footing dangerous. He skidded and fell, and had to run at a slower pace to keep his footing. And still the temperature dropped, and the wind growled and snapped like an angry beast.

He saw light through a heavily shuttered window. He stopped and pounded at the shutters, but no sound came from inside. He realized that the people of Tetrahyde never helped anyone; the more who died, the more chance there was for the survivors. So Barrent continued running, on feet that felt like chunks of wood.

The wind shrieked in his ear, and hailstones the size of his fist pelted the ground. He was getting too tired to run. All he could do now was walk, through a frozen white world, and hope he would reach the Wee Coven.

He walked for hours or for years. At one corner he passed the bodies of two men huddled against a wall and covered with frost. They had stopped running and had frozen to death.

Barrent forced himself to run again. A stitch in his side felt like a knife wound, and the cold was creeping up his arms and down his legs. Soon the cold would reach his chest, and that would be the end.