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.