The Secret Service men jumped back into the car and Kennedy and I went along the sh.o.r.e road following the two crooks.

Already the wounded crook, supported by his pal, had made his way down to the water and had come to a long wharf. There, near the land-end, they had a secret hiding-place into which they went. The other crook drew forth a smoke signal and began to prepare it.

Kennedy and I were able, now, to move faster than they. As we came in sight of the wharf, Kennedy paused.

"There they are, two of them," he indicated.

I could just make them out in their hiding-place. The fellow who had stolen the torpedo was by this time so weak from loss of blood that he could hardly hold his head up, while the other hurried to fix-the smoke signal. He happened to glance up, and saw us.

"Come, Red, brace up," he muttered. "They're on our trail."

The wounded man was almost too weak to answer. "I--I can't," he gasped weakly, "You--go." Then, with a great effort, remembering the mission on which he had been sent, he whispered hoa.r.s.ely, "I hid the second torpedo model in the Dodge house in the bottom of--" He tried hard to finish, but he was too weak. He fell back, dead.

His pal had waited as long as he dared to learn the secret. He jumped up and ran out just as we burst into the hiding-place.

Kennedy dropped down by the dead man and searched him, while I dashed after the other fellow. But I was not so well acquainted with the lay of the land as he and, before I knew it, he had darted into another of his numerous hiding-places. I hunted about, but I had lost the track.

When I returned, I found Kennedy writing a hasty note.

"I couldn't follow him, Craig," I confessed.

"Too bad," frowned Craig evidently greatly worried by what had happened, as he folded the note. "Walter," he added seriously, "I want you to go find the fellow." He handed me the note. "And if anything separates us to-day--give this note to Elaine."

I did not pay much attention to the tone he a.s.sumed, but often afterward I pondered over it and the serious and troubled look on his face. I was too chagrined at losing my man to think much of it then. I took the note and hurried out again after him.

Meanwhile, as nearly as I can now make out, Kennedy searched the dead man again. There was certainly no clue to his ident.i.ty on him, nor had he the torpedo model. Craig looked about. Suddenly, he fell flat on his stomach.

There was Wu Fang himself, coming to the wharf, carrying the model of the torpedo which had been stolen in Washington and brought up to him by his emissary.

Kennedy, crouching down and taking advantage of every object that sheltered him, crawled cautiously into an angle. Unsuspecting, Wu came to the land-end of the wharf.

There he saw his lieutenant, dead--and the smoke signal still beside him, unlighted. He bent over in amazement and examined the man.

From his hiding-place Kennedy crept stealthily. He had scarcely got within reach of Wu when the alert Chinaman seemed to sense his presence. He rose quickly and swung around.

The two arch enemies gazed at each other a moment silently. Each knew it was the final, fatal encounter.

Slowly Wu drew a long knife and leaped at Kennedy who grappled with him. They struggled mercilessly.

In the struggle, Craig managed to tear the torpedo out of Wu's hands, just as they rolled over. It fell on a rock. Instantly an explosion tore a hole in the sand, scattering the gravel all about.

Relentlessly the combat raged. Out on the wharf itself they went, right up to the edge.

Then both went over into the water, locked in each other's vice-like grip.

Even in the water, they struggled, frantically.

My search for the escaped crook was unsuccessful.

Somehow, however, it led me across country to a road. As I approached, I heard a car and looked up. There were the Secret Service men. I called them and stepped out of the bushes. They stopped and jumped out of the car and I ran to them.

"Come back with me," I urged. "We found two of them. One is dead. Craig sent me to trace the other. I've lost the trail. Perhaps you can find it for me."

We crashed through the brush quickly. Suddenly I heard something that caused me to start. It sounded like an explosion.

"There's the place--over there," I pointed, pausing and indicating the direction of the wharf whence had come the explosion.

What was it? We did not stop a moment, but hurried in that direction.

We reached the sh.o.r.e where we saw marks of the explosion and of a fight. Out on the pier I ran breathlessly. I rushed to the very edge and gazed over, then climbed down the slippery piling and peered into the black water beneath.

A few bubbles seemed to ooze up from below. Was that all?

No, as I gazed down I saw that some dark object was there. Slowly Wu Fang's body floated to the surface and lay there, rocked by the waves.

Deep in his breast stuck his own knife with its handle of the Sign of the Serpent!

I reached down and seized him, as I peered about for Kennedy.

There was nothing more there.

"Craig!" I called desperately, "Craig!"

There was no answer. The silence, the echo of the lapping water under the wharf was appalling, mocking.

I managed to call the Secret Service men and they got Wu Fang's body up on the wharf.

But I could not leave the spot.

Where was Craig? There was not a sign of him. I could not realize it, even when the men brought grappling irons and began to search the black water.

It was all a hideous dream. I saw and heard, in a daze.

It was not until late that night that I returned to the Dodge house.

I had delayed my return as long as I could, but I knew that I must see Elaine some time.

As I entered even Jennings must have seen that something was wrong.

Elaine, who was sitting in the library with Aunt Josephine, rose as she saw me.

"Did you get them?" she asked eagerly.

I could not speak. She seemed to read the tragic look on my haggard face and stopped.

"Why," she gasped, clutching at the desk, "what is the matter?"