effective. He could make out the faint outlines of stationary objects, of depths beyond depths, of crisscrossing lines and angles.

In utter darkness the glint of metal often seemed to draw the eyes like a magnet, to make itself known even without illumination. But there seemed to be a faint glow far off somewhere. He couldn't be sure, but light there should have been if—as he more than half-suspected—he was in one of the ship's below-deck ballast or storage compartments.

The deck beneath his feet was straight and level and cluttered with no impediments. He moved forward warily, testing every step until a wall of metal stopped him. He halted abruptly, felt along the barrier and became aware that it was studded with small bolts and was just a little corrugated. Exhibit A: one supporting metal beam, rough and slightly uneven in texture. Abruptly he reached the end of it and found himself underway again, still moving cautiously to avoid unseen pitfalls. He had not progressed more than a dozen feet when he heard the scrape of footsteps other than his own, and someone moved up close to him and blocked his way in the darkness.

For an instant the wild thought went through his mind that the someone was the captain. But he had seen and talked with the Captain and that self-contained, blunt-spoken man wasn't nearly as big physically as the path-blocker seemed to be.

The someone did not speak. But Corriston could sense the enmity flowing from him, the utter refusal to budge an inch, the determination to make his nearness a deadly threat in itself. Then the someone moved back a step. The far-off light could hardly have been an illusion, because for the barest instant Corriston could dimly make out the huge bulk of the man and the glint of the knife in his hand.

Two big men in the space of half an hour! The first had ceased to draw breath and the second was his killer. Corriston was suddenly sure of it. He knew it instinctively.

Then began the struggle which had almost robbed Corriston of his life, the cruel, one-sided, impossible-to-win struggle in total darkness.

And Corriston had won it.

Now almost in disbelief, Corriston looked down at the knife he had taken from the loser, telling himself that it was impossible that so much could have happened in so short a time and that he could still be alive at the end of it.

The wound in his shoulder was no longer painless, but it had ceased to bleed profusely, and his exploring fingers convinced him that the knife had severed no more than a superficial ligament. He strained his ears in the sudden quiet, listening for a possible return of his adversary. He did not think that the defeated man would attempt a second attack. But there was no telling what he might or might not do. Probably he'd ascended the companionway by now and was mingling with the other passengers.

The final link in Corriston's search had snapped. Even while battling for his life, he had felt close to the vanished girl. The man who had killed Clakey had been at least a link, a link that, short of Corriston's total defeat, might have been seized upon with physical violence and made to yield up its secret.

Now Corriston found himself wondering if the defeated man had been telling the truth. Had the link been non-existent from the first? Was the killer as completely in the dark as he was as to the whereabouts of Ramsey's daughter?

It was difficult to believe that the man had been lying. Despite his hatred and denials he had offered Corriston a deal: "Tell me where the girl is and I may not kill you." The deal part had been a lie, of course. He would have gone on and attempted to kill Corriston anyway. But his plea for information, that tentative, cunning feeler in the dark had seemed genuine.

What had been the man's purpose in killing Clakey? Why had Clakey been murdered in the general passenger cabin, in plain view of the other passengers? Because the killer had seen the girl go into the lounge and thought she was still there? And because he wanted free and instant access to her, with Clakey out of the way? It was the only answer that made sense.

The killer must have known that Clakey was in Ramsey's employ and had been guarding Ramsey's daughter. Why then had he been unable to take advantage of his crime in any way? Apparently neither he nor a possible confederate had succeeded in what almost certainly had been a pattern of violence directed at Ramsey through his daughter—a plan obviously worked out in advance, ready to be put into operation the instant a promising opportunity presented itself.

Into Corriston's mind flashed an ugly picture of the girl pinioned by strong arms and with a handkerchief pressed to her face. She had ceased to struggle and was being spirited quickly away. The picture became even more intolerable when he saw her held captive in a cabin difficult to locate, at the mercy of men without compassion.

But for some reason he'd never cease to be thankful for, it hadn't happened that way. Something had gone wrong with the plan, and the killer didn't even know when and why and how she had vanished. Sharing Corriston's frustration, he had been struggling simply to save himself, to keep Corriston from identifying and exposing him. The fury he'd displayed was not difficult to understand.

Corriston found himself becoming more confident again, less dominated by despair. The change in his mood surprised him but he seized upon it gratefully and started building on it. There was only one logical next move. He must find the captain quickly and enlist his help. He must take the master of the ship fully into his confidence. With every gift of persuasion at his command, he must make the captain see how the danger of Ramsey's daughter was mounting and would continue to mount with every minute that she remained unfound.

He still felt dizzy, and his head was aching a little, but he moved quickly through the darkness, his faculties heightened by an intensity of purpose which enabled him to find the companionway without colliding with obstacles or taking a wrong turn. Up the stairway he climbed, still clutching the knife, prepared for a possible second encounter with its original owner.

An attempt to regain the knife by trickery and stealth would not have surprised him. In fact, it was not at all difficult for him to picture a silent form flattened against the stair-rail, waiting for just the right moment to come hurtling toward him out of the darkness. For a moment, as he ascended, the strain became almost unendurable. Then the darkness dissolved above him, and he was advancing toward the captain's cabin through the narrow passageway which he had spanned with his arms spread wide.

He did not stop to span it this time. He emerged into the cabin and stood for an instant blinking in the sudden light. The cabin was still deserted. It was anybody's guess where the captain had gone or when he would be returning, and Corriston decided not to wait. He walked to the door, opened it and stepped out into the general passenger cabin.

No one saw him immediately. There were several passengers fairly close to him, but they were being attentive for the moment to the words and gestures of a tall, dignified looking man with observant brown eyes, a ruddy complexion, and gold braid on his shoulders. The tall man was Captain John Sanders.

"I'd be a hypocrite and a liar if I said there was no justification for alarm," Sanders was saying, in a voice loud enough to carry to where Corriston was standing. "Strict regulations prescribe that sort of thing. But it's no way for a captain to keep the respect of his passengers."

Corriston felt himself stepping forward before he even thought about it. But he halted abruptly when the captain said: "There's a murderer on the loose aboard this ship. You may as well accept that fact right now. Each of you has to be on his guard. It's only right and proper that you should keep your eyes and ears open, and stay worried. If you