Houston finished his coffee, dropped a coin on the counter, and headed for the other side of the street.

The big problem was getting into the building itself. It was ringed with alarms; La.s.ser & Sons didn"t want just anybody wandering in and out of their building.

So Houston had arranged a roundabout way. The building next to the La.s.ser Building was a good deal smaller, only forty-five stories high. A week before, Houston had rented an office on the eighteenth floor of the building; on the door, he had already had a sign engraved: Ajax Enterprises.

It was a shame the office would never be used.

Houston walked straight to the next-door building and opened the front door with his key. Inside, a night watchman lounged behind a desk, smoking a blackened briar. He looked up, smiled, and nodded.

"Evening, Mr. Griswold; working late tonight?"

Houston forced a smile he did not feel. "Just doing a little paper work," he said.

He took the automatic elevator to the eighteenth floor. He didn"t relish the idea of walking up to the roof, but taking the elevator would make the night.w.a.tchman suspicious.

He didn"t bother going to the office; he headed directly for the stairway and began his long climb--twenty-seven floors to the roof.

All through it, he kept up a running comment through his throat mike. "I wish I weighed about fifty pounds less; carrying two hundred and twenty pounds of blubber up these stairs isn"t easy."

"Blubber, hooey!" the earphone interrupted. "Any man who"s six-feet-three has a right to carry that much weight. Actually, you"re a skinny-looking sort of goop."

Both men were exaggerating; Houston wasn"t fat, but his broad, powerful frame couldn"t be called skinny, either.

When he finally reached the roof, he paused and surveyed the wall of the La.s.ser Building, which towered high above him, spearing an additional thirty stories in the air. Up there, the lights on the sixtieth floor gleamed in the night.

The air was growing cooler, and the beginnings of a mist were forming.

Houston hoped it wouldn"t start to rain before he got inside.

The forty-sixth floor of the La.s.ser Building had no windows on this side, but there were plenty on the forty-seventh.

Leading up to them was an inviting looking fire escape, but Houston knew he didn"t dare take that. By law, every fire escape was rigged with a fire alarm, in addition to the regular burglar alarm. He"d have to use another way.

The La.s.ser Building was a steel structure, sh.e.l.led over with a bright blue anodized aluminum sheath. Only the day before, Houston, wearing the gray coverall of a power-line workman, had checked the wall to find the big steel beams beneath the aluminum. He had also installed certain other equipment; now he was going to make use of it.

Concealed in the louvres of the air-conditioner intake of the lower building was a specially constructed suit and several hundred feet of power line which was connected to the main line of the building.

In the darkness, Houston slipped on the suit. It was constructed somewhat like a light diving suit or a s.p.a.cesuit, but without the helmet. In the toes, knees, and hands, were powerful electromagnets controlled by switches in the fingers of the gloves and powered by the current in the long line.

Houston stepped over to the blue aluminum wall, reached out a hand, and lowered one finger. Instantly, the powerful magnet anch.o.r.ed his hand to the wall, held by the dense magnetic field to the steel beam beneath the aluminum sheath. That one magnet alone could support his full body weight, and he had six magnets to work with.

Slowly, carefully, David Houston began to crawl up the wall.

Turn on a magnet in the right hand; lift up the left hand and anchor it higher; turn on the right hand and lift it even with the left, then anchor it again; do the same with both legs; then begin the process all over again, turning the magnets off and on in rotation.

Up and up he went. Past the forty-sixth floor, past the forty-seventh, the forty-eighth, and the forty-ninth. Not until he reached the fiftieth floor did he attempt to open one of the windows.

There was a magnetic lock inside the window, but Houston had taken that, too, into account. The powerful magnet in his right glove slid it aside easily. Houston lifted the window and stepped inside.

He had ten more floors to go.

He took off the suit and rolled it up into a tight package, then dropped it out the window. It landed with a barely audible thump. Houston took a deep breath, drew his stun gun, and headed for the stairway.

On the landing of the sixtieth floor of the La.s.ser Building, David Houston paused for a moment.

"Sounds like you"re out of breath," said the voice in his ear.

"You try climbing all that way sometime," Houston whispered. "I"m no superman, you know."

"Shucks," said the voice, "you"ve disillusioned me. What now?"

"I"m going to try to get a little information," Houston told him. "Hold on."

On the other side of the door, he could hear faint sound, as if someone were moving around, but he could hear no voices.

Carefully, he sent out a probing thought, trying to see if he could attune his mind with that of someone inside without betraying himself.

He couldn"t detect anything. The sixtieth floor covered a lot of s.p.a.ce; if whoever was inside was too far away, their thoughts would be too faint to pick up unless Houston stepped up his own power, and he didn"t want to do that.

Cautiously, he reached out a hand and eased open the door.

The hallway was brightly lit, but there was no one in sight. The unaccustomed light made Houston blink for a moment before his eyes adjusted to it; the hallways and landings below had been pitch dark, forcing him to use a penlight to find his way up.

He stepped into the hallway, closing the door behind him.

Now he could hear voices. He stopped to listen. The conversation was coming from an office down the hall--if it could be called a conversation.

There would be long periods of silence, then a word or two: "But not that way." "Until tomorrow." "Vacillates."

There were three different voices.

Houston moved on down the hall, his stun gun ready. A few yards from the door, he stopped again, and, very gently, he sent out another thought-probe, searching for the minds of those within, carefully forging his way.

And, at that crucial instant, a voice spoke in his ear.

"Houston! What"s going on? You haven"t said a thing for two full minutes!"

"I"m all right!" Houston snapped. Only the force of long training and habit kept him from shouting the words aloud instead of keeping them to a subvocal whisper.

"All right or not," said the other, "we"re coming in in seven minutes, as ordered. Meanwhile, there"s a news bulletin for you; the British division has picked up another Controller--a woman named Dorrine Kent.

Two in one night ought to be a pretty good bag."