McClane said, "Please believe me, Mr. Quail; we stumbled onto this entirely by accident. In the work we do --"

"I believe you," Quail said. He seemed tired, now; the drug was continu­ing to pull him under, deeper and deeper. "Where did I say I'd been?" he murmured. "Mars? Hard to remember -- I know I'd like to see it; so would everybody else. But me --" His voice trailed off. "Just a clerk, a nothing clerk."

Straightening up, Lowe said to his superior. "He wants a false memory implanted that corresponds to a trip he actually took. And a false reason which is the real reason. He's telling the truth; he's a long way down in the narkidrine. The trip is very vivid in his mind -- at least under sedation. But apparently he doesn't recall it otherwise. Someone, probably at a government military-sciences lab, erased his conscious memories; all he knew was that going to Mars meant something special to him, and so did being a secret agent. They couldn't erase that; it's not a memory but a desire, undoubtedly the same one that motivated him to volunteer for the assignment in the first place."

The other technician, Keeler, said to McClane, "What do we do? Graft a false memory-pattern over the real memory? There's no telling what the results would be; he might remember some of the genuine trip, and the con­fusion might bring on a psychotic interlude. He'd have to hold two opposite premises in his mind simultaneously: that he went to Mars and that he didn't. That he's a genuine agent for Interplan and he's not, that it's spurious. I think we ought to revive him without any false memory implantation and send him out of here; this is hot."

"Agreed," McClane said. A thought came to him. "Can you predict what he'll remember when he comes out of sedation?"

"Impossible to tell," Lowe said. "He probably will have some dim, diffuse memory of his actual trip, now. And he'd probably be in grave doubt as to its validity; he'd probably decide our programming slipped a gear-tooth. And he'd remember coming here; that wouldn't be erased -- unless you want it erased."

"The less we mess with this man," McClane said, "the better I like it. This is nothing for us to fool around with; we've been foolish enough to -- or unlucky enough to -- uncover a genuine Interplan spy who has a cover so perfect that up to now even he didn't know what he was -- or rather is." The sooner they washed their hands of the man calling himself Douglas Quail the better.

"Are you going to plant packets Three and Sixty-two in his conapt?" Lowe said.

"No," McClane said. "And we're going to return half his fee."

" 'Half'! Why half?"

McClane said lamely, "It seems to be a good compromise."

As the cab carried him back to his conapt at the residential end of Chicago, Douglas Quail said to himself, It's sure good to be back on Terra.

Already the month-long period on Mars had begun to waver in his mem­ory; he had only an image of profound gaping craters, an ever-present ancient erosion of hills, of vitality, of motion itself. A world of dust where little hap­pened, where a good part of the day was spent checking and rechecking one's portable oxygen source. And then the life forms, the unassuming and modest gray-brown cacti and maw-worms.

As a matter of fact he had brought back several moribund examples of Martian fauna; he had smuggled them through customs. After all, they posed no menace; they couldn't survive in Earth's heavy atmosphere.

Reaching into his coat pocket, he rummaged for the container of Martian maw-worms --

And found an envelope instead.

Lifting it out, he discovered, to his perplexity, that it contained five hun­dred and seventy poscreds, in cred bills of low denomination.

Where'd I get this?, he asked himself. Didn't I spend every 'cred I had on my trip?

With the money came a slip of paper marked: One-half fee ret'd. By McClane. And then the date. Today's date.

"Recall," he said aloud.

"Recall what, sir or madam?" the robot driver of the cab inquired respect­fully.

"Do you have a phone book?" Quail demanded.

"Certainly, sir or madam." A slot opened; from it slid a microtape phone book for Cook County.

"It's spelled oddly," Quail said as he leafed through the pages of the yellow section. He felt fear, then; abiding fear. "Here it is," he said. "Take me there, to Rekal, Incorporated. I've changed my mind; I don't want to go home."

"Yes, sir or madam, as the case may be," the driver said. A moment later the cab was zipping back in the opposite direction.

"May I make use of your phone?" he asked.

"Be my guest," the robot driver said. And presented a shiny new emperor 3-D color phone to him.

He dialed his own conapt. And after a pause found himself confronted by a miniature but chillingly realistic image of Kirsten on the small screen. "I've been to Mars," he said to her.

"You're drunk." Her lips writhed scornfully. "Or worse."

" 's God's truth."

"When?" she demanded.

"I don't know." He felt confused. "A simulated trip, I think. By means of one of those artificial or extra-factual or whatever it is memory places. It didn't take."

Kirsten said witheringly, "You are drunk." And broke the connection at her end. He hung up, then, feeling his face flush. Always the same tone, he said hotly to himself. Always the retort, as if she knows everything and I know nothing. What a marriage. Keerist, he thought dismally.

A moment later the cab stopped at the curb before a modern, very attrac­tive little pink building, over which a shifting polychromatic neon sign read: REKAL, INCORPORATED.

The receptionist, chic and bare from the waist up, started in surprise, then gained masterful control of herself. "Oh, hello, Mr. Quail," she said nervously. "H-how are you? Did you forget something?"

"The rest of my fee back," he said.

More composed now, the receptionist said, "Fee? I think you are mis­taken, Mr. Quail. You were here discussing the feasibility of an extra-factual trip for you, but --" She shrugged her smooth pale shoulders. "As I under­stand it, no trip was taken."

Quail said, "I remember everything, miss. My letter to Rekal, Incorpo­rated, which started this whole business off. I remember my arrival here, my visit with Mr. McClane. Then the two lab technicians taking me in tow and administering a drug to put me out." No wonder the firm had returned half his fee. The false memory of his "trip to Mars" hadn't taken -- at least not entirely, not as he had been assured.

"Mr. Quail," the girl said, "although you are a minor clerk you are a good-looking man and it spoils your features to become angry. If it would make you feel any better, I might, ahem, let you take me out..."

He felt furious, then. "I remember you," he said savagely. "For instance the fact that your breasts are sprayed blue; that stuck in my mind. And I remember Mr. McClane's promise that if I remembered my visit to Rekal, Incorporated I'd receive my money back in full. Where is Mr. McClane?"

After a delay -- probably as long as they could manage -- he found himself once more seated facing the imposing walnut desk, exactly as he had been an hour or so earlier in the day.

"Some technique you have," Quail said sardonically. His disappointment -- and resentment -- was enormous, by now. "My so-called 'memory' of a trip to Mars as an undercover agent for Interplan is hazy and vague and shot full of contradictions. And I clearly remember my dealings here with you people. I ought to take this to the Better Business Bureau." He was burning angry, at this point; his sense of being cheated had overwhelmed him, had destroyed his customary aversion to participating in a public squabble.

Looking morose, as well as cautious, McClane said, "We capitulate, Quail. We'll refund the balance of your fee. I fully concede the fact that we did absolutely nothing for you." His tone was resigned.