I caught up with the Chinaman and we had a little struggle, but he managed to break away and raised his axe threateningly. A shout from Kennedy caused him to turn and run down the flight of stairs, Kennedy closely behind him.

In the main hall of the apartment house were two elevator shafts facing the street entrance, some twenty-five or thirty feet away. Through the street door the janitor and two or three other men were running in.

They had heard the noise of the fighting above.

Escape to the street was cut off. We were behind him on the flight of stairs.

Long Sin did not hesitate a moment. He ran to the elevator, the door of which was open, seized the elevator boy and sent him sprawling on the marble floor. Then he slammed the door and the elevator shot up.

Kennedy was only a few feet behind, and he took in the situation at a glance. He leaped into the other elevator, and before the surprised boy could interfere shot it up only a few feet behind Long Sin.

Up the two elevators rose, Kennedy firing as best he could at Long Sin, while the shots reverberated through the elevator shaft like cannon.

It was a wild race to the roof. Long Sin had the start, and as the elevator reached the top floor he flung it open, dashed out and through a door up to the roof itself.

A second later Kennedy's elevator stopped. Craig leaped out and fired his last shot at the legs of Long Sin as he disappeared at the top of the flight of stairs to the roof. He flung the revolver from him and followed.

Without a moment's hesitation Kennedy threw himself at Long Sin. They struggled with each other. Finally Long Sin managed to wrench one arm lose and raise the Tong axe over Kennedy's head.

Kennedy dodged back. As he did so he tripped on the very edge of the roof and went sliding down the slates of the mansard.

Fortunately he was able to catch himself in the gutter.

It was the opportunity that Long Sin wanted. He started across the rope, which he had stretched from this apartment house to the building across the court, with all the deftness of the most expert Chinese acrobat.

By this time I had reached the roof, followed by the janitor and the elevator boys.

Kennedy was now crawling up the mansard, helping himself as best he could by some of the ornamental ironwork. I hurried over with the janitor, and together we pulled him out of danger.

Long Sin had reached the roof on the opposite side as we ran across in the direction of the taut rope.

A moment later he returned and bowed at us mockingly, then disappeared behind a skylight.

Kennedy did not stop an instant.

"You fellows go down to the street and see if you can head him off that way," he cried. "Stay here, Walter."

Before I knew it he had seized the rope and was going across to the other building, hand over hand. It was a perilous undertaking, but his blood was up.

Kennedy had almost reached the other roof when suddenly from behind the skylight stepped Long Sin. With a wicked leer, he advanced to the edge of the roof, his axe upraised. I looked across the yawning chasm, horrified.

Slowly Long Sin raised the axe above his head, gathering all the strength which he had, waiting for Kennedy to approach closer. Kennedy stopped. Swiftly the axe descended, slashing the rope at one blow.

Like the weight of a pendulum Kennedy swung back against our own building, managing to keep his hold on the rope with superhuman strength.

I bent far over the edge of the roof, fully expecting to see him dashed to pieces at the bottom of the court.

There was a tremendous shattering of gla.s.s.

The rope had been just long enough to make him strike a window and he had gone crashing through the gla.s.s three floors below.

I dashed down the stairs and into the apartment. Kennedy was lying on the floor badly cut. I raised him up. He was dazed and considerably overcome; but as he staggered to his feet with my help I saw that no bones were broken.

"Help me, quick, Walter," he urged, moving toward the elevators.

Meanwhile Long Sin had quickly dived down into the next building. A few moments later he had come out on the ground floor at the rear.

Gazing about to see whether he was followed, he disappeared.

Back in the apartment, Elaine and Aunt Josephine were just about to run out when the two Chinamen who had been knocked out recovered. One of them threw himself on Elaine. Aunt Josephine tried to ward him off, but the other one struck her and threw her down.

Before she could recover they had seized Elaine.

With a hasty guttural exclamation they picked her up and ran out.

Instead of going down-stairs they crossed the hallway, slamming the door behind them.

As Kennedy and I reached the ground floor we saw the janitor and one of the elevator boys on either side of Aunt Josephine.

"Elaine! Elaine!" she cried.

"What's the matter?" demanded Kennedy, leaning heavily on me.

"They have kidnapped her," cried Aunt Josephine.

Kennedy pulled himself together.

"Tell me, quick--how did it happen?" he demanded of Aunt Josephine.

"It was the ring," she cried, handing it to him.

Kennedy took the ring and looked at it for a moment. Then he turned to us blankly.

All the rooms were empty.

Elaine had been spirited away.

CHAPTER III

THE WATCHING EYE

Not a clue was left by the kidnappers when they so mysteriously spirited Elaine away from the apartment of Wu Fang. She had disappeared as completely as if she had vanished into the thin air.

Kennedy was frantic. Wu and Long Sin themselves seemed to have vanished, too. Where they held her, what had happened to her was a sealed book. And yet, no move of ours was made, no matter how secret, that it did not seem to be known to them. It was as though a weird, uncanny eye glared at us, watching everything.