Thurid approached and examined the handle of the lever.

"Ah, a magnet," he said. "I will remember. It is settled then I take it," he continued.

The old man hesitated. A look of combined greed and apprehension overspread his none too beautiful features.

"Double the figure," he said. "Even that were all too small an amount for the service you ask. Why, I risk my life by even entertaining you here within the forbidden precincts of my station. Should Salensus Oll learn of it he would have me thrown to the apts before the day was done."

"He dare not do that, and you know it full well, Solan," contradicted the black. "Too great a power of life and death you hold over the people of Kadabra for Salensus Oll ever to risk threatening you with death. Before ever his minions could lay their hands upon you, you might seize this very lever from which you have just warned me and wipe out the entire city."

"And myself into the bargain," said Solan, with a shudder.

"But if you were to die, anyway, you would find the nerve to do it," replied Thurid.

"Yes," muttered Solan, "I have often thought upon that very thing. Well, First Born, is your red princess worth the price I ask for my services, or will you go without her and see her in the arms of Salensus Oll tomorrow night?"

"Take your price, yellow man," replied Thurid, with an oath. "Half now and the balance when you have fulfilled your contract."

With that the dator threw a well-filled money-pouch upon the table.

Solan opened the pouch and with trembling fingers counted its contents. His weird eyes assumed a greedy expression, and his unkempt beard and mustache twitched with the muscles of his mouth and chin. It was quite evident from his very mannerism that Thurid had keenly guessed the man's weakness-even the clawlike, clutching movement of the fingers betokened the avariciousness of the miser.

Having satisfied himself that the amount was correct, Solan replaced the money in the pouch and rose from the table.

"Now," he said, "are you quite sure that you know the way to your destination? You must travel quickly to cover the ground to the cave and from thence beyond the Great Power, all within a brief hour, for no more dare I spare you."

"Let me repeat it to you," said Thurid, "that you may see if I be letter-perfect."

"Proceed," replied Solan.

"Through yonder door," he commenced, pointing to a door at the far end of the apartment, "I follow a corridor, passing three diverging corridors upon my right; then into the fourth right-hand corridor straight to where three corridors meet; here again I follow to the right, hugging the left wall closely to avoid the pit.

"At the end of this corridor I shall come to a spiral runway, which I must follow down instead of up; after that the way is along but a single branchless corridor. Am I right?"

"Quite right, Dator," answered Solan; "and now begone. Already have you tempted fate too long within this forbidden place."

"Tonight, or tomorrow, then, you may expect the signal," said Thurid, rising to go.

"Tonight, or tomorrow," repeated Solan, and as the door closed behind his guest the old man continued to mutter as he turned back to the table, where he again dumped the contents of the money-pouch, running his fingers through the heap of shining metal; piling the coins into little towers; counting, recounting, and fondling the wealth the while he muttered on and on in a crooning undertone.

Presently his fingers ceased their play; his eyes popped wider than ever as they fastened upon the door through which Thurid had disappeared. The croon changed to a querulous muttering, and finally to an ugly growl.

Then the old man rose from the table, shaking his fist at the closed door. Now he raised his voice, and his words came distinctly.

"Fool!" he muttered. "Think you that for your happiness Solan will give up his life? If you escaped, Salensus Oll would know that only through my connivance could you have succeeded. Then would he send for me. What would you have me do? Reduce the city and myself to ashes? No, fool, there is a better way-a better way for Solan to keep thy money and be revenged upon Salensus Oll."

He laughed in a nasty, cackling note.

"Poor fool! You may throw the great switch that will give you the freedom of the air of Okar, and then, in fatuous security, go on with thy red princess to the freedom of-death. When you have passed beyond this chamber in your flight, what can prevent Solan replacing the switch as it was before your vile hand touched it? Nothing; and then the Guardian of the North will claim you and your woman, and Salensus Oll, when he sees your dead bodies, will never dream that the hand of Solan had aught to do with the thing."

Then his voice dropped once more into mutterings that I could not translate, but I had heard enough to cause me to guess a great deal more, and I thanked the kind Providence that had led me to this chamber at a time so filled with importance to Dejah Thoris and myself as this.

But how to pass the old man now! The cord, almost invisible upon the floor, stretched straight across the apartment to a door upon the far side.

There was no other way of which I knew, nor could I afford to ignore the advice to "follow the rope." I must cross this room, but however I should accomplish it undetected with that old man in the very center of it baffled me.

Of course I might have sprung in upon him and with my bare hands silenced him forever, but I had heard enough to convince me that with him alive the knowledge that I had gained might serve me at some future moment, while should I kill him and another be stationed in his place Thurid would not come hither with Dejah Thoris, as was quite evidently his intention.

As I stood in the dark shadow of the tunnel's end racking my brain for a feasible plan the while I watched, catlike, the old man's every move, he took up the money-pouch and crossed to one end of the apartment, where, bending to his knees, he fumbled with a panel in the wall.

Instantly I guessed that here was the hiding place in which he hoarded his wealth, and while he bent there, his back toward me, I entered the chamber upon tiptoe, and with the utmost stealth essayed to reach the opposite side before he should complete his task and turn again toward the room's center.

Scarcely thirty steps, all told, must I take, and yet it seemed to my overwrought imagination that that farther wall was miles away; but at last I reached it, nor once had I taken my eyes from the back of the old miser's head.

He did not turn until my hand was upon the button that controlled the door through which my way led, and then he turned away from me as I passed through and gently closed the door.

For an instant I paused, my ear close to the panel, to learn if he had suspected aught, but as no sound of pursuit came from within I wheeled and made my way along the new corridor, following the rope, which I coiled and brought with me as I advanced.

But a short distance farther on I came to the rope's end at a point where five corridors met. What was I to do? Which way should I turn? I was nonplused.

A careful examination of the end of the rope revealed the fact that it had been cleanly cut with some sharp instrument. This fact and the words that had cautioned me that danger lay beyond the KNOTS convinced me that the rope had been severed since my friend had placed it as my guide, for I had but passed a single knot, whereas there had evidently been two or more in the entire length of the cord.

Now, indeed, was I in a pretty fix, for neither did I know which avenue to follow nor when danger lay directly in my path; but there was nothing else to be done than follow one of the corridors, for I could gain nothing by remaining where I was.

So I chose the central opening, and passed on into its gloomy depths with a prayer upon my lips.