I almost betrayed myself with a gasp! A dim bulk showed in the translucent depths of the wall. It rushed toward me, took form. A fish, a huge, blind fish, its cavernous mouth stretched wide. It came straight for me, just above. In a second it would leap through. A scream of terror trembled in my throat. Then it hit the edge of the translucent green wall--and vanished! Was I dreaming? Had Jim hit me too hard?

Something stirred in the back of my mind. I sensed dimly that here lay the explanation of the disappearance of the _New York_, the very mystery that I had come to solve. Almost I had it; then it slipped away.

"Here's the doctor!" someone said. There was a little stir of activity about me. I allowed my eyes to close, as if in utter weariness.

"What's all this? What have you got here?" A gruff voice, intolerant.

"One of our sub-sea scouts, sir. Just come back, after some delay. Her eye was smashed, and there are grapple marks on her. Must have been caught, and then slipped away. She was leaking badly. We got her through the lock just in time." Jim had evidently added a few touches of his own. "Comrade Pauloff seems to have been seriously injured.

He's got a bad cut on his scalp, and was unconscious till a moment ago. Opened his eyes just as you came along."

"Hm. Let's see." I felt a none too gentle hand finger my wound. It throbbed maddeningly. The doctor spoke again. "A nasty crack, but no fracture. Here, you--wake up." I made no move. "Come on, wake up!" I heard the plop of a cork being drawn from a bottle; a pungent odor a.s.sailed my nostrils, choked me. I writhed, pulled at the hand holding the bottle to my nose and opened my eyes.

"That's better. How do you feel now?"

I raised a hand to my injury and muttered, in Russian. "Hurts, papashka." I kept my expression as blank, as uncomprehending, as I could.

The doctor flashed an understanding glance at the captain, then turned back to me. "What's your name?"

Memories of my grandmother's tales of her youth came flooding back to me. "Pavel, son of Pauloff."

It was the formula of the Russian student, in his teens.

"Your rank?"

"Second year. Petrovski Gymnasium."

The physician turned away. "No use bothering him now. A clear case of amnesia.

"He's been thrown back to his high school days. I've had a number of cases like that among your scouts lately." Blessed inspiration! "Only cure is rest. Get him over to the infirmary. We'll evacuate him to a base hospital to-morrow."

I was in a cool white bed, in a low ceilinged room, white painted.

There were other beds, vacant. A uniformed male nurse puttered around.

There was an elusive green tinge to the light that poured in through the one window.

The door opened and a sergeant came in. "Comrade Alexis!"

"Well, what is it now? Have they found another gold-bricking officer to mess up my clean beds?"

"A party from corps headquarters will be here in fifteen minutes for inspection."

"Let them come. They won't find any specks of rust on my instruments, like they did on Comrade Borisoff's."

"They'd better not. You know what happened to him."

"Yeah. Chucked into the ray. Well, he didn't give the burial squad any work." And the two laughed, a laugh that had more than a hint of s.a.d.i.s.tic cruelty in it. "If I had my way," the nurse went on, "I'd do the same with all these nuts that come back from the scout ships raving of home and mother. It's my idea that they're all bluffing.

It's a good way to be shipped to the rear, where the captured dames are. Say, did I tell you about the last time I was on leave--"

The two whispered, their heads close together. My brain was working frantically. Things had gone well so far, but I had to get out of here before the morning, or I'd be sent to the base and lose all that I had gained by my daring.

The door snapped open. "_Smirnow!_" (Atten-_shun!_)

I was on my side, facing away from the wall. I remained so, staring blankly across the room. I hoped the inspection would be over quickly.

The fewer the enemy officers I had looking me over, the better.

Someone back there was snapping questions. That voice--where had I heard it before?

"Your patient. What's his trouble?"

"Amnesia, sir. One of the scouts."

"Oh, yes. Let's look at him."

Someone was walking across the room, then standing above me. His hand was just at the level of my eyes--a hand with the little finger twisted queerly into the palm. I knew that hand: it was the _Ferret's_! A cold shiver ran up my back. I almost stopped breathing.

Of all the infernal luck in the world, to have the Ferret walk in here! He was chief of the Red's Intelligence Service, the shrewdest, sharpest, cruelest of them all. Many of our best men had gone west because of his uncanny instinct for piercing disguise. They said he could _smell_ an American. And many of our most strictly guarded plans had been smashed through his infernally clever spying. Only a month before I had him in my clutches; saw the very rope around his neck.

But he had slipped away, and left me empty-handed and kicking myself for an a.s.s.

I held my breath as I felt those gimlet eyes of his boring into me.

Would he sense who I was? Surely he could hear the pounding of my heart. How long he stood there I don't know. It seemed like hours. I tautened, waiting for him to call out, determined to sell my life as dearly as I could.

But for once the Ferret was fooled. He turned away. "Take us into your kitchen," he snapped at the nurse, then there was the tramping of feet and the slamming of a door.

The breath whistled from me in relief. I turned cautiously. I was alone. Now was my chance. I jumped from the bed and started toward the window. Once out, I'd find some place to hide. I let my face relax; there was no use for that particular disguise any longer. The window was up. I was on the sill. Another second and I'd be out in the open.

"Just where do you think you're going?" came the Ferret's silky, cruel voice. I whirled. There he was, just inside the door. His little black eyes glinted dangerously over his hooked nose and sharp chin.

"Oh--Bolton! Something made me turn back. Glad to see you."

His hand flashed to the ray-tube in his belt. At the same moment I left the window sill in a desperate leap. Clear across the room I sprang, and before he had time to pull his weapon I had one hand clamped around his wrist, the other clutching his throat. We crashed to the ground.

I was in pyjamas, barefooted, he fully clothed. His leather shoes drove into me viciously, even as his face turned purple. The pain was excruciating, but I dared not cry out. His left thumb found my eye, was digging in.

The crash of our fall must have been heard outside; another moment and all would be lost. I was momentarily on top as we rolled across the floor. With a supreme effort I pulled his head away from the floor, then crashed it down. He slumped; lay still.

The door k.n.o.b was turning as I jumped frantically through the window.

I heard a cry behind me. Rough, uneven ground. No one about. To my right was a rocky cliff, and at its base what looked like the mouth of a cave. Any port in a storm: I dived into it.

It was a cave, all right, or rather a narrow tunnel winding some distance into the cliff. I ran back at top speed, till I crashed into the end of the pa.s.sage.