his legs. The change in the stricken man's expression was ghastly. His cheeks had gone dead white, and now, as Corriston stared, a spasm convulsed his features, twisting them into a horrible, unnatural caricature of a human face—a rigidly contorted mask with a blanched, wide-angled mouth and bulging eyes.

A passenger saw him and screamed. His knees had given way and his huge frame seemed to be coming apart at the joints. He straightened out on the deck, jerking his head spasmodically, propelling himself backwards by his elbows. Almost as if with conscious intent, his body arched itself, sank level with the floor, then arched itself again.

It was as though all of his muscles and nerves were protesting the violence that had been done to him, and were seeking by muscular contractions alone to dislodge the stiff, thorned horror protruding from his flesh.

He went limp and the barbed shaft ceased to quiver. Corriston had a nerve-shattering glimpse of a swiftly spreading redness just above Clakey's right hipbone. The entire barb turned red, as if its feathery spines had acquired a sudden, unnatural affinity for human blood.

Corriston started forward, then changed his mind. Several passengers had moved quickly to Clakey's side and were bending above him. Someone called out: "Get a doctor!"

Corriston turned abruptly and strode toward the ladies' lounge. Brushing aside such scruples as he ordinarily would have entertained, he threw open the door and went inside.

He called out: "Miss Ramsey?" When he received no answer he searched the lounge thoroughly. There was no one there. He was thinking fast now, desperately fast. He hadn't seen her come out and neither had Clakey. He'd seen four women come out: three young women and an elderly one. None of them faintly resembled the girl he'd been talking to.

The first young woman had emerged almost immediately. He remembered how intently Clakey had been watching the door. Clakey had sat down to discuss the Station with him, and in less than two minutes the first young lady had emerged. Then neither of them had taken their eyes from the door for five or six minutes. The second young lady had apparently known someone in the crowd. She had seemed annoyed by Clakey's persistent stare and had disappeared quickly. The elderly woman had looked her age. Her walk, her carriage, the lines of her face had borne the unmistakable stamp of genteel aging, and the dignity inseparable from it. The last woman had been the drab creature.

Corriston had a poor memory for faces and he knew that he couldn't count on recognizing any of them—except perhaps the elderly woman—if he saw them again.

It was good that he could smile, even at his own inanities. It relieved tension. Almost instantly the smile vanished. His aspect became that of a man in deadly danger on the brink of a hundred foot precipice, a man completely in the dark and yet grimly determined not to go over the edge or take a single step in the wrong direction.

Where, he asked himself, do women ordinarily go when they vanish into thin air? Wasn't it pretty well established that ghosts were likely to follow the path of least resistance and fulfill obligations entered into in the flesh?

The captain's cabin! The captain would be disappointed if she failed to appear at least briefly at his table; and she had promised to do so. It was a wild, premeditated assault on the rational, but putting the irrational aspect of it aside, it was also realistic and reasonable. If by some incredible miracle she had eluded Clakey's vigilance and actually slipped from the lounge, she would almost certainly have gone straight to the captain's cabin.

3

Corriston left the ladies' lounge faster than he had entered it. He shut the door firmly and stood for an instant staring at the passengers who had gathered in an even tighter knot around Clakey and were making it difficult for an alarmed young ship's doctor to get to him. He was quite sure in his own mind that Clakey would not need the assistance of a doctor.

Then he turned and headed for the captain's cabin. Anyone could have gotten in. The door was ajar and there was no one guarding it. He threw the door wide and everything was just as he'd expected to find it: It was completely empty.

No guests at all to welcome Corriston to the big, empty cabin. Then he saw that there was another door opposite.

Corriston was getting scared, really scared. There was an odd, detached, whimsical feeling at the surface of his mind, but it cloaked something distinctly sinister. He had more than half-expected the captain to be absent from his cabin. But something about the silence and the emptiness chilled him to the core of his being.

With an effort he shook the feeling off. He didn't know where the inner door led to. He hesitated for an instant, realizing that the mere existence of a second door could complicate his search to the point of futility. If it led to a second cabin—well and good. But if it didn't....

He strained his ears to catch the sound of voices. There were no voices. He could have simply crossed to the door and looked beyond it. But the state of his nerves, and an odd habit he had of being precise and cautious under tension, made him explore the other possibilities first.

The door might conceivably be a trap. A trap does not have to be contrived in advance with some clearly defined purpose in mind. Circumstances can take a door or a window and turn it into a trap. A glove or a weapon left lying about can be picked up by an innocent man and snare him most damnably by seeming to point up his guilt.

What purpose did the inner door serve? Did it open on a corridor leading back to the general passenger cabin? If it did, it wouldn't be a trap; it would simply have "blind alley" stamped all over it.

Corriston suddenly realized that he was succumbing to a crazy kind of inaction. The door could lead almost anywhere, and if he had any sense at all he'd go through it fast.

Go through it he did, in six long strides. He'd been right about one thing—the blind alley part. He found himself, in not quite total darkness, in what was unquestionably an intership passageway. There was just light enough for him to make out the shadowy walls on both sides of him. Rather they were like metal bulkheads that gave off just enough reflected light for him to see by.

He wouldn't have considered ten or twelve seconds spent with a pocket flash a waste of time. But he had no pocket flash. The best he could do was stretch out both of his arms to determine just how far apart the bulkheads were. They were less than six feet apart.

Well, no sense in measuring the walls. A girl he'd talked to and liked instantly had vanished in a dark world, and he knew now that there was more than mere liking in the way he felt about her. He didn't dare ask himself how much more, not in so confined a space and with his chances of finding her again dwindling with every second that passed.

The passageway ended in a blank wall, less than forty feet from its beginning. Corriston saw the wall and was advancing toward it when he suddenly realized that the deck itself wasn't continuous. In his path, and almost directly underfoot, a companionway entrance yawned, so unexpectedly close that another short step would have sent him plunging into it. He saw the faint light reflected on its circumference and halted just in time to avoid a possibly fatal fall.

He knelt and stared down into a spiraling web of darkness. He could see a faint glimmer of light on metal and knew that he was bending above either a circular staircase or a companionway ladder. It turned out to be a staircase. Down it he went, moving cautiously, holding on to the supporting guide rail as he descended deeper and deeper into the darkness.

The darkness became almost absolute when the stairs ended. For a moment, at least, what appeared to be utter blackness engulfed him. Then gradually his vision became more