in snapping magnetic lines to her lock. Some minutes later the three of them passed into her. There was still air in her cabins and corridors. Air that bore a faint corrupt taint which set Bat to sniffing greedily and could be picked up even by the less sensitive human nostrils.
Cliff headed straight for the control cabin but Steena and Bat went prowling. Closed doors were a challenge to both of them and Steena opened each as she passed, taking a quick look at what lay within. The fifth door opened on a room which no woman could leave without further investigation.
I don’t know who had been housed there when the Empress left port on her last lengthy cruise. Anyone really curious can check back on the old photo-reg cards. But there was a lavish display of silks trailing out of two travel kits on the floor, a dressing table crowded with crystal and jeweled containers, along with other lures for the female which drew Steena in. She was standing in front of the dressing table when she glanced into the mirror—glanced into it and froze.
Over her right shoulder she could see the spider-silk cover on the bed. Right in the middle of that sheer, gossamer expanse was a sparkling heap of gems, the dumped contents of some jewel case. Bat had jumped to the foot of the bed and flattened out as cats will, watching those gems, watching them and—something else!
Steena put out her hand blindly and caught up the nearest bottle. As she unstoppered it she watched the mirrored bed. A gemmed bracelet rose from the pile, rose in the air and tinkled its siren song. It was as if an idle hand played…. Bat spat almost noiselessly. But he did not retreat. Bat had not yet decided his course.
She put down the bottle. Then she did something which perhaps few of the men she had listened to through the years could have done. She moved without hurry or sign of disturbance on a tour about the room. And, although she approached the bed she did not touch the jewels. She could not force herself to that. It took her five minutes to play out her innocence and unconcern. Then it was Bat who decided the issue.
He leaped from the bed and escorted something to the door, remaining a careful distance behind. Then he mewed loudly twice. Steena followed him and opened the door wider.
Bat went straight on down the corridor, as intent as a hound on the warmest of scents. Steena strolled behind him, holding her pace to the unhurried gait of an explorer. What sped before them both was invisible to her but Bat was never baffled by it.
They must have gone into the control cabin almost on the heels of the unseen—if the unseen had heels, which there was good reason to doubt—for Bat crouched just within the doorway and refused to move on. Steena looked down the length of the instrument panels and officers’ station-seats to where Cliff Moran worked. On the heavy carpet her boots made no sound and he did not glance up but sat humming through set teeth as he tested the tardy and reluctant responses to buttons which had not been pushed in years.
To human eyes they were alone in the cabin. But Bat still followed a moving something with his gaze. And it was something which he had at last made up his mind to distrust and dislike. For now he took a step or two forward and spat—his loathing made plain by every raised hair along his spine. And in that same moment Steena saw a flicker—a flicker of vague outline against Cliff’s hunched shoulders as if the invisible one had crossed the space between them.
But why had it been revealed against Cliff and not against the back of one of the seats or against the panels, the walls of the corridor or the cover of the bed where it had reclined and played with its loot? What could Bat see?
The storehouse memory that had served Steena so well through the years clicked open a half-forgotten door. With one swift motion she tore loose her spaceall and flung the baggy garment across the back of the nearest seat.
Bat was snarling now, emitting the throaty rising cry that was his hunting song. But he was edging back, back toward Steena’s feet, shrinking from something he could not fight but which he faced defiantly. If he could draw it after him, past that dangling spaceall…. He had to—it was their only chance.
“What the….” Cliff had come out of his seat and was staring at them.
What he saw must have been weird enough. Steena, bare-armed and shouldered, her usually stiffly-netted hair falling wildly down her back, Steena watching empty space with narrowed eyes and set mouth, calculating a single wild chance. Bat, crouched on his belly, retreating from thin air step by step and wailing like a demon.
“Toss me your blaster.” Steena gave the order calmly—as if they still sat at their table in the Rigel Royal.
And as quietly Cliff obeyed. She caught the small weapon out of the air with a steady hand—caught and leveled it.
“Stay just where you are!” she warned. “Back, Bat, bring it back!”
With a last throat-splitting screech of rage and hate, Bat twisted to safety between her boots. She pressed with thumb and forefinger, firing at the spacealls. The material turned to powdery flakes of ash—except for certain bits which still flapped from the scorched seat—as if something had protected them from the force of the blast. Bat sprang straight up in the air with a scream that tore their ears.
“What…?” began Cliff again.
Steena made a warning motion with her left hand. “Wait!”
She was still tense, still watching Bat. The cat dashed madly around the cabin twice, running crazily with white-ringed eyes and flecks of foam on his muzzle. Then he stopped abruptly in the doorway, stopped and looked back over his shoulder for a long silent moment. He sniffed delicately.
Steena and Cliff could smell it too now, a thick oily stench which was not the usual odor left by an exploding blaster-shell.
Bat came back, treading daintily across the carpet, almost on the tips of his paws. He raised his head as he passed Steena and then he went confidently beyond to sniff, to sniff and spit twice at the unburned strips of the spaceall. Having thus paid his respects to the late enemy he sat down calmly and set to washing his fur with deliberation. Steena sighed once and dropped into the navigator’s seat.
“Maybe now you’ll tell me what in the hell’s happened?” Cliff exploded as he took the blaster out of her hand.
“Gray,” she said dazedly, “it must have been gray—or I couldn’t have seen it like that. I’m colorblind, you see. I can see only shades of gray—my whole world is gray. Like Bat’s—his world is gray too—all gray. But he’s been compensated for he can see above and below our range of color vibrations and—apparently—so can I!”
Her voice quavered and she raised her chin with a new air Cliff had never seen before—a sort of proud acceptance. She pushed back her wandering hair, but she made no move to imprison it under the heavy net again.
“That is why I saw the thing when it crossed between us. Against your spaceall it was another shade of gray—an outline. So I put out mine and waited for it to show against that—it was our only chance, Cliff.
“It was curious at first, I think, and it knew we couldn’t see it—which is why it waited to attack. But when Bat’s actions gave it away it moved. So I waited to see that flicker against the spaceall and then I let him have it. It’s really very simple….”
Cliff laughed a bit shakily. “But what was this gray thing? I don’t get it.”
“I think it was what made the Empress a derelict. Something out of space, maybe, or from another world somewhere.” She waved her hands. “It’s invisible because it’s a color beyond our range of sight. It must have stayed in here all these years. And it kills—it must—when its curiosity is satisfied.” Swiftly she described the scene in the cabin and the strange behavior of the gem pile which had betrayed the creature to her.
Cliff did not return his blaster to its holder. “Any more of them on board, d’you think?” He didn’t look pleased at the prospect.
Steena turned to Bat. He was paying particular attention to the space between two front toes in the process of a complete bath. “I don’t think so. But Bat will tell us if there are. He can see