"Suffering is a state of mind," he said in a low tone, "and I have decided that it would be poor revenge for me to harm you. You are free."

Nothing could have come as a greater surprise to Elaine. Even Long Sin had not expected any such speech as this. Elaine, however, was wonder-stricken.

"Do you--do you really mean it?" she asked, scarcely able to believe what her ears heard.

Wu merely nodded, and with a wave of his hand to Long Sin indicated that Elaine was to be released.

Long Sin, the slave, did not stop to question his master, but merely moved over to a closet and took out the hat and wraps which Elaine had worn when she had been kidnapped in the up-town apartment. He handed them over to her and she put them on with trembling hands.

No one stopped her and she nerved herself to take several steps toward the door. She had scarcely crossed half the room.

"Wait!" ordered Wu sharply.

Was he merely torturing her, as a cat might torture a mouse? She stopped obediently, afraid to look at him.

"This will be the vengeance of Wu Fang," he went on impressively.

"Slowly, one by one, your friends will weaken and die, then your family, until finally only you are left. Then will come your turn."

He stopped again and raised his long lean forefinger. "Go," he hissed.

"I wish you much joy."

He turned to Long Sin and whispered a word to him. A moment later, Long Sin drew forth a large silken handkerchief and tied it tightly over Elaine's eyes. Then he took her hand and led her out. There was to be no chance by which she could lead a raiding party back to the den in which she had been held.

I don't think that in all our friendship I have ever seen Kennedy so utterly depressed as he was when we returned after the discovery of the vast fortune which Bennett had cleverly secreted. I came upon him in the laboratory the next morning while he was trying to read. He had laid aside his scientific work, and now he had even laid aside his book.

There seemed to be absolutely nothing to do until some new clue turned up. I placed my hand on his shoulder, but the words that would encourage him died on my lips. Several times I started to speak, but each time I checked myself. There did not seem to be anything that would be appropriate for such an occasion.

A sharp ring at the telephone made both of us fairly jump, so nervous had we become. Kennedy reached over instantly for the instrument in the vague hope that at last there was some news.

As I watched his face, it changed first from despair to wonder, and finally it seemed to light up with the most remarkable look of relief and happiness that one could imagine.

"I shall be right over," he cried, jamming the receiver down on the hook, and in the same motion reaching for his hat and coat. "Walter,"

he cried, "it is Elaine! They have let her go!"

I seized my own hat and coat in time to follow him and we dashed out of the laboratory.

The suspense under which Aunt Josephine had been living had told on her. Her niece, Elaine's cousin, Mary Brown, who lived at Rockledge, had come into the city to comfort Aunt Josephine and they had been sitting, that morning, in the library. Marie, the maid was busy about the room, while Aunt Josephine talked sadly over Elaine's strange disappearance. She was on the verge of tears.

Suddenly a startled cry from Jennings out in the hall caused both ladies to jump to their feet. They could scarcely believe what they heard as the faithful old butler cried out the name.

"Why--Miss Elaine!" he gasped.

An instant later Elaine herself burst into the room and flung herself into Aunt Josephine's arms. All talking and half crying from joy at once, they crowded about her. Breathlessly she answered the questions that flew thick and fast.

In the excitement Aunt Josephine had seized the telephone and called our number. She did not even wait to break the good news, but handed the telephone to Elaine herself.

We left the laboratory on the run, too fast to notice that just around the building line at the corner stood a limousine with shades drawn.

Even if we had paused to glance back, we could not have seen Wu Fang and Long Sin inside, gazing out through the corner of the curtains.

They were in European dress now and had evidently come prepared for just what they knew was likely to happen.

In all the strange series of events, I doubt whether we had ever made better time from the laboratory over to the Dodge house than we did now. We were admitted by the faithful Jennings and almost ran into the library.

"Oh, Craig!" cried Elaine, as Kennedy, almost speechless, seized her by both hands.

For a few seconds none of us could speak. Then followed a veritable flood of eager conversation.

I watched Elaine carefully, in fact we all did, for she seemed, in spite of the excitement of her return, to be almost a complete nervous wreck from the terrible experiences she had undergone.

"Won't you come and stay with me a few days up in the country, dear?"

urged Mary at last.

Elaine thought a moment, then turned to Aunt Josephine.

"Yes," considered her aunt, "I think it would do you good."

Still she hesitated; then shyly looked at Kennedy and laughed. "You, too, Craig, must be f.a.gged out," she said frankly. "Come up there with us and take a rest."

Kennedy smiled. "I shall be delighted," he accepted promptly.

"You, too, Mr. Jameson," she added, turning to me.

I hesitated a moment and Kennedy tried to catch my eye. I was just about to speak when he brought his heel down sharply on my toe. I looked at him again and caught just the trace of a nod of his head. I saw that I was de trop.

"No, thank you," I replied. "I'm afraid I'd better not go. Really, I have too much work staring at me. I can't get away--but it's very kind of you to think of asking me."

We chatted, then left a few moments later so that Kennedy could pack.

Around the corner from the laboratory, as we dashed out, had been, as I have said, Wu Fang and Long Sin looking out from the limousine. No sooner had we disappeared across the campus than their driver started up the car and they sped around to our apartment.

Cautiously they alighted and walked down the street. Then making sure they were not observed, they entered and mounted the stairs to our doorway. Long Sin was stationed down the hall on guard while Wu Fang drew from his pocket a blank key, a file and a candle. He lighted the candle and held the key in its flame until it was covered with soot.

Then he inserted the key in the keyhole, turned it and took the key out. Working quickly now, he examined the key sharply. In the soot were slight scratches indicating where it struck and prevented the turning of the lock. He filed the key, trying it again and again. Finally he finished, and opened the door. Beckoning Long Sin, he entered our rooms.

As they stood there, Wu Fang gazed about our living-room, keenly. He was evidently considering where to place something, for, one after another, he picked up several articles on the desk and examined them.

Each time that he laid one down he shook his head.

Finally his eye rested on the telephone. It seemed to suggest an idea to him and he crossed over to it. Carefully holding down the receiver on the hook, he unscrewed the case which holds the diaphragm, while with his clever fingers he held the rest of the instrument intact. Then he removed from his pocket the vial which the coolie had given him and placed its contents on the diaphragm itself. Quickly now he replaced the receiver, and, having finished their work, Long Sin and Wu Fang stealthily crept out.

A second time, as we approached our apartment after the visit to Elaine, we were too excited to notice the limousine in which were Wu and Long Sin. But no sooner had we entered than Long Sin left the car with a final word of instruction from his master.

Up-stairs, in the apartment, Kennedy began hurriedly to pack, and I helped him as well as I could. We were in the midst of it when the telephone rang and I answered it.

"h.e.l.lo!" I called.

There was no response.

"h.e.l.lo, h.e.l.lo!" I repeated, raising my voice.