building, small copters and robotcabs veered, discharging passengers; and the moving sidewalks were crowded with people coming and going. Here and there in the crowd, standing out because of their height and the silvery metallic cloaks they wore, were the strange tall figures of the Lhari.

"Well, how about going down?" Tommy glanced impatiently at his timepiece. "Less than half an hour before the starship touches down."

"All right. We can get a sidewalk over here." Reluctantly, Bart tore his eyes from the fascinating spectacle, and followed Tommy, stepping onto one of the sidewalks. It bore them down a long, sloping ramp toward the floor of the spaceport, then sped toward the glass skyscraper; came to rest at the wide pointed doors, depositing them in the midst of the crowd. The jagged lightning flash was there over the doors of the building, and the words:

Bart remembered, as if it were yesterday, how he and his father had first passed through this doorway. And his father, looking up, had said under his breath "Not for always, Son. Someday men will have a doorway to the stars, and the Lhari won't be standing in the door."

Inside the building, it was searingly bright. The high open rotunda was filled with immense mirrors, and glass ramps running up and down, moving staircases, confusing signs and flashing lights on tall oddly shaped pillars. The place was crowded with men from all over the planet, but the dark glasses they all wore gave them a strange sort of family resemblance.

Tommy said, "I'd better check my reservations."

Bart nodded. "Meet you on the upper level later," he said, and got on a moving staircase that soared slowly upward, past level after level, toward the information desk located on the topmost mezzanine.

The staircase moved slowly, and Bart had plenty of time to see everything. On the step immediately in front of him, two Lhari were standing; with their backs turned, they might almost have been men. Unusually tall, unusually thin, but men. Then Bart amended that mentally. The Lhari had two arms, two legs and a head apiece—they were that much like men. Their faces had two eyes, two ears, and a nose and mouth, all in the right places. But the similarity ended there.

They had skin of a curious pale silvery gray, and pale, pure-white hair rising in what looked like a feathery crest. The eyes were long and slanting, the forehead high and narrow, the nose delicately thin and chiseled with long vertically slit nostrils, the ears long, pointed and lobeless. The mouth looked almost human, though the chin was abnormally pointed. The hands would almost have passed inspection as human hands—except for the long, triangular nails curved over the fingertips like the claws of a cat. They wore skin-tight clothes of some metallic silky stuff, and long flowing gleaming silvery capes. They looked unearthly, elfin and strange, and in their own way they were beautiful.

The two Lhari in front of Bart had been talking softly, in their fast twittering speech; but as the hum of the crowds on the upper levels grew louder, they raised their voices, and Bart could hear what they were saying. He was a little surprised to find that he could still understand the Lhari language. He hadn't heard a word of it in years—not since his Mentorian mother died. The Lhari would never guess that he could understand their speech. Not one human in a million could speak or understand a dozen words of Lhari, except the Mentorians.

"Do you really think that human—" the first Lhari spoke the word as if it were a filthy insult—"will have the temerity to come in by this ship?"

"No reasonable being can tell what humans will do," said the second Lhari. "But then, no reasonable being can tell what our own Port Authorities will do either! If the message had only reached us sooner, it would have been easier. Now I suppose it will have to clear through a dozen officials and a dozen different kinds of formalities."

The younger Lhari sounded angry. "And we have only a description—no name, nothing! How do they expect us to do anything under those conditions? What I can't understand is how it ever happened, or how the man managed to get away. What worries me is the possibility that he may have communicated with others we don't know about. Those bungling fools who let the first man get away can't even be sure—"

"Do not speak of it here," said the old Lhari sharply. "There are Mentorians in the crowd who might understand us." He turned and looked straight at Bart, and Bart felt as if the slanted strange eyes were looking right through to his bones. The Lhari said, in Universal, "Who are you, boy? What iss your businesssses here?"

Bart replied in the same language, politely, "My father's coming in on this ship. I'm looking for the information desk."

"Up there," said the old Lhari, pointing with a clawed hand, and lost interest in Bart. He said to his companion, in their own language, "Always, I regret these episodes. I have no malice against humans. I suppose even this Vegan that we are seeking has young, and a mate, who will regret his loss."

"Then he should not have pried into Lhari matters," said the younger Lhari fiercely. "If they'd killed him right away—"

The soaring staircase swooped up to the top level; the two Lhari stepped off and mingled swiftly with the crowd, being lost to sight. Bart whistled in dismay as he got off and turned toward the information desk. A Vegan! Some poor guy from his own planet was in trouble with the Lhari. He felt a cold, crawling chill down his insides. The Lhari had spoken regretfully, but the way they'd speak of a fly they couldn't manage to swat fast enough. Sooner or later you had to get down to it, they just weren't human!

Here on Earth, nothing much could happen, of course. They wouldn't let the Lhari hurt anyone—then Bart remembered his course in Universal Law. The Lhari spaceport in every system, by treaty, was Lhari territory. Once you walked beneath the lightning-flash sign, the authority of the planet ceased to function; you might as well be on that unbelievably remote world in another galaxy that was the Lhari home planet—that world no human had ever seen. On a Lhari spaceport, or on a Lhari ship, you were under the jurisdiction of Lhari law.

Tommy stepped off a moving stair and joined him. "The ship's on time—it reported past Luna City a few minutes ago. I'm thirsty—how about a drink?"

There was a refreshment stand on this level; they debated briefly between orange juice and a drink with a Lhari name that meant simply cold sweet, and finally decided to try it. The name proved descriptive; it was very cold, very sweet and indescribably delicious.

"Does this come from the Lhari world, I wonder?"

"I imagine it's synthetic," Bart said.

"I suppose it won't hurt us?"

Bart laughed. "They wouldn't serve it to us if it would. No, men and Lhari are alike in a lot of ways. They breathe the same air. Eat about the same food." Their bodies were adjusted to about the same gravity. They had the same body chemistry—in fact, you couldn't tell Lhari blood from human, even under a microscope. And in the terrible Orion Spaceport wreck sixty years ago, doctors had found that blood plasma from humans could be used for wounded Lhari, and vice versa, though it wasn't safe to transfuse whole blood. But then, even among humans there were five blood types.

And yet, for all their likeness, they were different.

Bart sipped the cold Lhari drink, seeing himself in the mirror behind the refreshment stand; a tall teen-ager, looking older than his seventeen years. He was lithe and well muscled from five years of sports and acrobatics at the Space Academy, he had curling red hair and gray eyes, and he was almost as tall as a Lhari.

Will Dad know me? I was just a little kid when he left