I felt my forehead wrinkle up as my theory fell apart. "Then they could buy food. Why should they have died of malnutrition?"

"Because, as May Roberts herself told you, nothing can exist before it exists. Neither can anything exist after it is out of existence. If you returned with a Dynapack, for example, it would revert to a lump of various metals, because that was what it was in your period. But let me give you a more personal instance. Do you remember coming back from your first trip with dust on your hand?"

"Yes. I must have fallen."

"On one hand? No, Mr. Weldon. May Roberts was greatly upset by the incident; she was afraid you would realize why the hamburger had turned to dust--and why the old people died of starvation. _All_ of them, not just a few."

He paused, giving me a chance to understand what he had just said. I did, with a sick shock.

"If I ate your food," I said shakily, "I'd feel satisfied until I was returned to my own time. _But the food wouldn't go along with me!_"

Blundell nodded gravely. "And so you, too, would die of malnutrition.

The foods we have given you existed in your era. We were very careful of that, so careful that many of them probably were stored years before you left your time. We regret that they are not very palatable, but at least we are positive they will go back with you. You will be as healthy when you arrive in the past as when you left.

"Incidentally, she made you change your clothes for the same reason--they had been made in 1930. She had clothing from every era she wanted visited and chose old people who would fit them best.

Otherwise, you see, they'd have arrived naked."

I began to shake as if I were as old as I'd pretended to be on the stage. "She's going to pull me back! If I don't bring her the information about the Dynapack, she'll shoot me!"

"That, Mr. Weldon, is our problem," Blundell said, putting his hand comfortingly on my arm to calm me.

"Your problem? I'm the one who'll get shot, not you!"

"But we know in complete detail what will happen when you are returned to the 20th Century."

I pulled my arm away and grabbed his. "You know that? Tell me!"

"I'm sorry, Mr. Weldon. If we tell you what you did, you might think of some alternate action, and there is no knowing what the result would be."

"But I didn't get shot or die of malnutrition?"

"That much we can tell you. Neither."

They all stood up, so bright and attractive in their colorful clothes that I felt like a shirt-sleeved stage hand who'd wandered in on a costume play.

"You will be returned in a month, according to the notes May Roberts left. She gave you plenty of time to get the data, you see. We propose to make that month an enjoyable one for you. The resources of our city--and any others you care to visit--are at your disposal. We wish you to take full advantage of them."

"And the Dynapack?"

"Let us worry about that. We want you to have a good time while you are our guest."

I did.

It was the most wonderful month of my life.

The mesh cage blurred around me. I could see May Roberts through it, her hand just leaving the switch. She was as beautiful as ever, but I saw beneath her beauty the vengeful, vicious creature her father's bitterness had turned her into; Blundell and Carr had let me read some of her notes, and I knew. I wished I could have spent the rest of my years in the future, instead of having to come back to this.

She came over and opened the gate, smiling like an angel welcoming a bright new soul. Then her eyes traveled startledly over me and her smile almost dropped off. But she held it firmly in place.

She had to, while she asked, "Do you have the notes I sent you for?"

"Right here," I said.

I reached into my breast pocket and brought out a stubby automatic and shot her through the right arm. Her closed hand opened and a little derringer clanked on the floor. She gaped at me with an expression of horrified surprise that should have been recorded permanently; it would have served as a model for generations of actors and actresses.

"You--brought back a weapon!" she gasped. "You shot me!" She stared vacantly at her bleeding arm and then at my automatic. "But you can't--bring anything back from the future. And you aren't--dying of malnutrition."

She said it all in a voice shocked into toneless wonder.

"The food I ate and this gun are from the present," I said. "The people of the future knew I was coming. They gave me food that wouldn't vanish from my cells when I returned. They also gave me the gun instead of the plans for the Dynapack."

[Ill.u.s.tration]

[Ill.u.s.tration]

"And you took it?" she screamed at me. "You idiot! I'd have shared the profits honestly with you. You'd have been worth millions!"

"With acute malnutrition," I amended. "I like it better this way, thanks--poor, but alive. Or relatively poor, I should say, because you've been very generous and I appreciate it."

"By shooting me!"

"I hated to puncture that lovely arm, but it wasn't as painful as starving or getting shot myself. Now if you don't mind--or even if you do--it's your turn to get into the cage, Miss Roberts."

She tried to grab for the derringer on the floor with her left hand.

"Don't bother," I said quietly. "You can't reach it before a bullet reaches you."

She straightened up, staring at me for the first time with terror in her eyes.

"What are you going to do to me?" she whispered.

"I could kill you as easily as you could have killed me. Kill you and send your body into some other era. How many dozens of deaths were you responsible for? The law couldn't convict you of them, but I can. And I couldn't be convicted, either."

She put her hand on the wound. Blood seeped through her fingers as she lifted her chin at me.

"I won't beg for my life, Weldon, if that's what you want. I could offer you a partnership, but I'm not really in a position to offer it, am I?"

She was magnificent, terrifyingly intelligent, brave clear through ...

and deadlier than a plague. I had to remember that.

"Into the cage," I said. "I have some friends in the future who have plans for you. I won't tell you what they are, of course; you didn't tell me what I'd go through, did you? Give my friends my fondest regards. If I can manage it, I'll visit them--and you."

She backed warily into the cage. It would have been pleasant to kiss those wonderful lips good-by. I'd thought about them for a whole month, wanting them and loathing them at the same time.