I smiled as I realized the effect that my surroundings seemed to be having upon my ordinarily steady nerves; and had resumed my preparations for the night when a shrill scream rang through the building.

I paused again and listened, and now I distinctly heard the sound of feet running rapidly. They seemed to be approaching, and I guessed that they were coming down the ramp from the level above to the corridor that ran before my quarters.

Perhaps what went on in the house of Fal Sivas was none of my affair, but I have never yet heard a woman scream without investigating; so now I stepped to the door of my living room and threw it open, and as I did so I saw a girl running rapidly toward me. Her hair was disheveled; and from her wide, frightened eyes she cast frequent glances backward over her shoulder.

She was almost upon me before she discovered me; and when she did she paused for a moment with a gasp of astonishment or fear, I could not tell which; then she darted past me through the open door into my living room.

"Close the door," she whispered, her voice tense with suppressed emotion. "Don't let him get me! Don't let him find me!"

No one seemed to be pursuing her, but I closed the door as she had requested and turned toward her for an explanation.

"What is the matter?" I demanded. "From whom were you running?"

"From him." She shuddered. "Oh, he is horrible. Hide me; don't let him get me, please!"

"Whom do you mean? Who is horrible?"

She stood there trembling and wide-eyed, staring past me at the door, like one whom terror had demented.

"Him," she whispered. "Who else could it be?"

"You mean--?"

She came close and started to speak; then she hesitated. "But why should I trust you? You are one of his creatures. You are all alike in this terrible place."

She was standing very close to me now, trembling like a leaf. "I cannot stand it!" she cried. "I will not let him!" And then, so quickly that I could not prevent her, she snatched the dagger from my harness and turned it upon herself.

But there I was too quick for her, seizing her wrist before she could carry out her designs.

She was a delicate-looking creature, but her appearance belied her strength.

However, I had little difficulty in disarming her; and then I backed her toward the bench and forced her down upon it.

"Calm yourself," I said; "you have nothing to fear from me-nothing to fear from anybody while I am with you. Tell me what has happened. Tell me whom you fear."

She sat there staring into my eyes for a long moment, and presently she commenced to regain control of herself. "Yes," she said presently, "perhaps I can trust you. You make me feel that way-your voice, your looks."

I laid my hand upon her shoulder as one might who would quiet a frightened child. "Do not be afraid," I said; "tell me something of yourself. What is your name?"

"Zanda," she replied.

"You live here?"

"I am a slave, a prisoner,"

"What made you scream?" I asked.

"I did not scream," she replied; "that was another. He tried to get me, but I eluded him, and so he took another. My turn will come. He will get me. He gets us all."

"Who? Who will get you?"

She shuddered as she spoke the name. "Fal Sivas," she said, and there was horror in her tone.

I sat down on the bench beside her and laid my hand on hers. "Quiet yourself," I said; "tell me what all this means. I am a stranger here. I just entered the service of Fal Sivas tonight."

"You know nothing, then, about Fal Sivas?" she demanded.

"Only that he is a wealthy inventor and fears for his life."

"Yes, he is rich; and he is an inventor, but not so great an inventor as he is a murderer and a thief. He steals ideas from other inventors and then has them murdered in order to safeguard what he has stolen. Those who learn too much of his inventions die. They never leave this house. He always has an assassin ready to do his bidding; sometimes here, sometimes out in the city; and he is always afraid of his life.

"Rapas the Ulsio is his assassin now; but they are both afraid of Ur Jan, chief of the guild of assassins; for Ur Jan has learned that Rapas is killing for Fal Sivas for a price far lower than that charged by the guild."

"But what are these wonderful inventions that Fal Sivas works upon?" I asked.

"I do not know all of the things that he does, but there is the ship.