body, so that no disease germ or stray fungus would be carried from planet to planet.

The bluish light died. Outside, the Mentorian gave him back his shoes and belt, handed him the paper sack of his belongings, and a paper cup full of greenish fluid.

"Drink this."

"What is it?"

The medic said patiently, "Remember, the R-rays killed all the microorganisms in your body, including the good ones—the antibodies that protect you against disease, and the small yeasts and bacteria that live in your intestines and help in the digestion of your food. So we have to replace those you need to stay healthy. See?"

The green stuff tasted a little brackish, but Bart got it down all right. He didn't much like the idea of drinking a solution of "germs," but he knew that was silly. There was a big difference between disease germs and helpful bacteria.

Another Mentorian official, this one a young woman, gave him a key with a numbered tag, and a small booklet with WELCOME ABOARD printed on the cover.

The tag was numbered 246-B, which made Bart raise his eyebrows. B class was normally too expensive for Bart's father's modest purse. It wasn't quite the luxury class A, reserved for planetary governors and ambassadors, but it was plenty luxurious. Briscoe had certainly sent him traveling in style!

B Deck was a long corridor with oval doors; Bart found one numbered 246, and, not surprisingly, the key opened it. It was a pleasant little cabin, measuring at least six feet by eight, and he would evidently have it to himself. There was a comfortably big bunk, a light that could be turned on and off instead of the permanent glow-walls of the cheaper class, a private shower and toilet, and a placard on the walls informing him that passengers in B class had the freedom of the Observation Dome and the Recreation Lounge. There was even a row of buttons dispensing synthetic foods, in case a passenger preferred privacy or didn't want to wait for meals in the dining hall.

A buzzer sounded and a Mentorian voice announced, "Five minutes to Room Check. Passengers will please remove all metal in their clothing, and deposit in the lead drawers. Passengers will please recline in their bunks and fasten the retaining straps before the steward arrives. Repeat, passengers will please...."

Bart took off his belt, stuck it and his cuff links in the drawer and lay down. Then, in a sudden panic, he got up again. His papers as Bart Steele were still in the sack. He got them out, and with a feeling as if he were crossing a bridge and burning it after him, tore up every scrap of paper that identified him as Bart Steele of Vega Four, graduate of the Space Academy of Earth. Now, for better or worse, he was—who was he? He hadn't even looked at the new papers Briscoe had given him!

He glanced through them quickly. They were made out to David Warren Briscoe, of Aldebaran Four. According to them, David Briscoe was twenty years old, hair black, eyes hazel, height six foot one inch. Bart wondered, painfully, if Briscoe had a son and if David Briscoe knew where his father was. There was also a license, validated with four runs on the Aldebaran Intrasatellite Cargo Company—planetary ships—with the rank of Apprentice Astrogator; and a considerable sum of money.

Bart put the papers in his pants pocket and the torn-up scraps of his old ones into the trashbin before he realized that they looked exactly like what they were—torn-up legal identity papers and a broken plastic card. Nobody destroyed identity papers for any good reason. What could he do?

Then he remembered something from the Academy. Starships were closed-system cycles, no waste was discarded, but everything was collected in big chemical tanks, broken down to separate elements, purified and built up again into new materials. He threw the paper into the toilet, worked the plastic card back and forth, back and forth until he had wrenched it into inch-wide bits, and threw it after them.

The cabin door opened and a Mentorian said irritably, "Please lie down and fasten your straps. I haven't all day."

Hastily Bart flushed the toilet and went to the bunk. Now everything that could identify him as Bart Steele was on its way to the breakdown tanks. Before long, the complex hydrocarbons and cellulose would all be innocent little molecules of carbon, oxygen, hydrogen; they might turn up in new combinations as sugar on the table!

The Mentorian grumbled, "You young people think the rules mean everybody but you," and strapped him far too tightly into the bunk. Bart felt resentful; just because Mentorians could work on Lhari ships, did they have to act as if they owned everybody?

When the man had gone, Bart drew a deep breath. Was he really doing the right thing?

If he'd refused to get out of the robotcab—

If he'd driven Briscoe straight to the police—

Then maybe Briscoe would still be alive. And now it was too late.

A warning siren went off in the ship, rising to hysterical intensity. Bart thought, incredulously, this is really happening. It felt like a nightmare. His father a fugitive from the Lhari. Briscoe dead. He himself traveling, with forged papers, to a star he'd never seen.

He braced himself, knowing the siren was the last warning before takeoff. First there would be the hum of great turbines deep in the ship, then the crushing surge of acceleration. He had made a dozen trips inside the solar system, but no matter how often he did it, there was the strange excitement, the little pinpoint of fear, like an exotic taste, that was almost pleasant.

The door opened and Bart grabbed a fistful of bed-ticking as two Lhari came into the room.

One of them said, in their strange shrill speech, "This boy is the right age."

Bart froze.

"You're seeing spies in every corner, Ransell," said the other, then in Universal, "Could we trrouble you for your paperesses, sirr?"

Bart, strapped down and helpless, moved his head toward the drawer, hoping his face did not betray his fear. He watched the two Lhari riffle through his papers with their odd pointed claws.

"What isss your planet?"

Bart bit his lip, hard—he had almost said, "Vega Four."

"Aldebaran Four."

The Lhari said in his own language, "We should have Margil in here. He actually saw them."

The other replied, "But I saw the machine that disintegrated. I still say there was enough protoplasm residue for two bodies."

Bart fought to keep his face perfectly straight.

"Did anyone come into your cabin?" The Lhari asked in Universal.

"Only the steward. Why? Is something wrong?"

"There iss some thought that a stowaway might be on boarrd. Of courrrse we could not allow that, anyone not prrroperly prrotected would die in the first shift into warp-drive."

"Just the steward," Bart said again. "A Mentorian."

The Lhari said, eying him keenly, "You are ill? Or discommoded?"

Bart grasped at random for an excuse. "That—that stuff the medic made me drink made me feel—sort of sick."

"You may send for a medical officer after acceleration," said the Lhari expressionlessly. "The summoning bell is at your left."

They turned and went out and Bart gulped. Lhari, in person, checking the passenger decks! Normally you never saw one on board; just Mentorians. The Lhari treated humans as if they were too dumb to bother about. Well, at least for once someone was acting as if humans were worthy antagonists. We'll show them—someday!

But he felt very alone, and scared....

A low hum rose, somewhere in the ship, and Bart grabbed ticking as he felt the slow surge. Then a violent sense of pressure popped his ear drums, weight crowded down on him like an elephant sitting on his chest, and there was a horrible squashed sensation dragging his limbs out of shape. It grew and grew. Bart lay still and sweated, trying to ease his uncomfortable position, unable to move so much as