Beam raced into the bathroom. Behind the plastic shower curtain was an opaque shape. It was Paul Tirol, lying wadded up in the tub, fully clothed. He was not dead but he had been struck behind the left ear and his scalp was leaking a slow, steady trickle of blood. Beam took his pulse, listened to his breathing, and then straightened up.

At the doorway Ellen Ackers materialized, still pale with fright. “Is he? Did I kill him?”

“He’s fine.”

Visibly, she relaxed. “Thank God. It happened so fast—he stepped ahead of me to take the M inside his place, and then I did it. I hit him as lightly as I could. He was so interested in it… he forgot about me.” Words spilled from her, quick, jerky sentences, punctuated by rigid tremors of her hands. “I lugged him back in the car and drove here; it was all I could think of.”

“What are you in this for?”

Her hysteria rose in a spasm of convulsive muscle-twitching. “It was all planned—I had everything worked out. As soon as I got hold of it I was going to—” She broke off.

“Blackmail Tirol?” he asked, fascinated.

She smiled weakly. “No, not Paul. It was Paul who gave me the idea … it was his first idea, when his researchers showed him the thing. The M, he calls it. M stands for machine. He means it can’t be educated, morally corrected.”

Incredulous, Beam said: “You were going to blackmail your husband.”

Ellen Ackers nodded. “So he’d let me leave.”

Suddenly Beam felt sincere respect for her. “My God—the rattle. Heimie didn’t arrange that; you did. So the device would be trapped in the apartment.”

“Yes,” she agreed. “I was going to pick it up. But Paul showed up with other ideas; he wanted it, too.”

“What went haywire? You have it, don’t you?”

Silently she indicated the linen closet. “I stuffed it away when I heard you.”

Beam opened the linen closet. Resting primly on the neatly-folded towels was a small, familiar, portable TV unit.

“It’s reverted,” Ellen said, from behind him, in an utterly defeated monotone. “As soon as I hit Paul it changed. For half an hour I’ve been trying to get it to shift. It won’t. It’ll stay that way forever.”

III

Beam went to the telephone and called a doctor. In the bathroom, Tirol groaned and feebly thrashed his arms. He was beginning to return to consciousness.

“Was that necessary?” Ellen Ackers demanded. “The doctor—did you have to call?”

Beam ignored her. Bending, he lifted the portable TV unit and held it in his hands; he felt its weight move up his arms like a slow, leaden fatigue. The ultimate adversary, he thought; too stupid to be defeated. It was worse than an animal. It was a rock, solid and dense, lacking all qualities. Except, he thought, the quality of determination. It was determined to persist, to survive; a rock with will. He felt as if he were holding up the universe, and he put the unreconstructed M down.

From behind him Ellen said: “It drives you crazy.” Her voice had regained tone. She lit a cigarette with a silver cigarette lighter and then shoved her hands in the pockets of her suit.

“Yes,” he said.

“There’s nothing you can do, is there? You tried to get it open before. They’ll patch Paul up, and he’ll go back to his place, and Lantano will be banished—” She took a deep shuddering breath. “And the Interior Department will go on as always.”

“Yes,” he said. Still kneeling, he surveyed the M. Now, with what he knew, he did not waste time struggling with it. He considered it impassively; he did not even bother to touch it.

In the bathroom, Paul Tirol was trying to crawl from the tub. He slipped back, cursed and moaned, and started his laborious ascent once again.

“Ellen?” his voice quavered, a dim and distorted sound, like dry wires rubbing.

“Take it easy,” she said between her teeth; not moving she stood smoking rapidly on her cigarette.

“Help me, Ellen,” Tirol muttered. “Something happened to me … I don’t remember what. Something hit me.”

“He’ll remember,” Ellen said.

Beam said: “I can take this thing to Ackers as it is. You can tell him what it’s for—what it did. That ought to be enough; he won’t go through with Lantano.”

But he didn’t believe it, either. Ackers would have to admit a mistake, a basic mistake, and if he had been wrong to pick up Lantano, he was ruined. And so, in a sense, was the whole system of delineation. It could be fooled; it had been fooled. Ackers was rigid, and he would go right on in a straight line: the hell with Lantano. The hell with abstract justice. Better to preserve cultural continuity and keep society running on an even keel.

“Tirol’s equipment,” Beam said. “Do you know where it is?”

She shrugged wildly. “What equipment?”

“This thing—“ he jabbed at the M—“was made somewhere.”

“Not here, Tirol didn’t make it.”

“All right,” he said reasonably. They had perhaps six minutes more before the doctor and the emergency medical carrier arrived on rooftop. “Who did make it?”

“The alloy was developed on Bellatrix.” She spoke jerkily, word by word. “The rind … forms a skin on the outside, a bubble that gets sucked in and out of a reservoir. That’s its rind, the TV shape. It sucks it back and becomes the M; it’s ready to act.”

“What made it?” he repeated.

“A Bellatrix machine tool syndicate … a subsidiary of Tirol’s organization. They’re made to be watchdogs. The big plantations on outplanets use them; they patrol. They get poachers.”

Beam said: “Then originally they’re not set for one person.”

“No.”

“Then who set this for Heimie? Not a machine tool syndicate.”

“That was done here.”

He straightened up and lifted the portable TV unit. “Let’s go. Take me there, where Tirol had it altered.”

For a moment the woman did not respond. Grabbing her arm he hustled her to the door. She gasped and stared at him mutely.

“Come on,” he said, pushing her out into the hall. The portable TV unit bumped against the door as he shut it; he held the unit tight and followed after Ellen Ackers.

The town was slatternly and run-down, a few retail stores, fuel station, bars and dance halls. It was two hours’ flight from Greater New York and it was called Olum.

“Turn right,” Ellen said listlessly. She gazed out at the neon signs and rested her arm on the window sill of the ship.

They flew above warehouses and deserted streets. Lights were few. At an intersection Ellen nodded and he set the ship down on a roof.

Below them was a sagging, fly-specked wooden frame store. A peeling sign was propped up in the window:

With the sign were doorknobs, locks, keys, saws, and spring-wound alarm clocks. Somewhere in the interior of the store a yellow night light burned fitfully.

“This way,” Ellen said. She stepped from the ship and made her way down a flight of rickety wooden stairs. Beam laid the portable TV unit on the floor of the ship, locked the doors, and then followed after the woman. Holding onto the railing, he descended to a back porch on which were trash cans and a pile of sodden newspapers tied with string. Ellen was unlocking a door and feeling her way inside.

First he found himself in a musty, cramped storeroom. Pipe and rolls of wire and sheets of metal were heaped everywhere; it was like a junkyard. Next came a narrow corridor and then he was standing in the entrance of a workshop. Ellen reached overhead and groped to find the hanging string of a light. The light clicked on. To the right was a long and littered workbench with a hand grinder at one end, a vise, a keyhole saw; two wooden stools were before the bench and half-assembled machinery was stacked on the floor in no apparent order. The workshop was chaotic, dusty, and archaic. On the wall was a threadbare blue coat hung from a nail: the workcoat of a machinist.