The Phantom Detective: 5 Murder Mysteries in One Volume. Robert Wallace
shall call upon you again, Professor Vonderkag," he said, and strode out.
As he went back up the incline and out into the main corridor, he noticed with surprise that the passageway was now heavily guarded, with sentries stationed every thirty or forty yards. Each of them threw their electric torches upon him and saluted him as he passed.
Several other men were standing along some distance ahead, receiving the same crisp salutations as himself. It didn't seem possible that he was soon to meet the Imperator in person. Yet the Imperator's name was the authority on that order in his pocket.
He passed through the cavern where the steel water door was set in the concrete, followed the two men ahead of him into the underground corridor marked SHAFT 9. The tunnel curved to the left away from the passage that led to the elevator cage up which Lannigan, he hoped, had made his escape.
Two guards at a heavy wooden door took up his written order, passed him on into an extraordinarily large and long chamber of cavernous height. The place, lighted by lanterns that threw grotesque shadows along the walls, was already a scene of weird assembly.
All of the men present were robed, hooded and masked. Each of them wore upon his sleeve a green circle of the clan. And through each circle ran the double zigzag emblem that marked them as ranking officers.
There was no fraternizing. The men did not gather in the usual small groups while they waited. Each man stood aloof from his companions, as though afraid of being caught discussing their mutual organization affairs.
The Phantom moved over against a wall, looking about eagerly for some centralizing nucleus to this strange silent gathering, There was no dais, no raised platform.
Suddenly, without preliminaries, an incisive, chilling and metallic voice filled the cavern—the same voice that had come over the air to announce the Rock Creek Dam disaster sixty seconds before it happened.
Van's darting eyes slid over the room, searching for the source of that metallic flow of words. Of the fifty men present, not a lip moved. Yet the voice went on:
"Attention, officers of the Invisible Empire! Rock Canyon Dam has been successfully destroyed! Not a clue that could be traced to us was left. And only ten of our men were obliged to sacrifice their lives to protect our Order. Their families, according to our constitution, will be financially independent now for seven generations."
Van's eyes glittered behind his white mask as the full significance of that statement struck him. With such a guarantee of financial security as a reward for sacrifices to this carefully schemed out organization, there was practically no limit to the hysterical courage which such a bait engendered.
The cold, inhuman voice went on: "Our next attack upon the government will occur at dawn on September 3rd. I myself, at that hour four days hence, will bomb the United States Treasury Building at Washington, using the airplane that has been built of the aluminum-calbite metal being manufactured here. A new explosive, more powerful than the explosive used at Rock Canyon, will be dropped from my plane. I shall detail a detachment to carry here the United States Treasury gold."
Throughout the cavern there was a sharp intake of greedy breath as this announcement was made. But the invisible speaker continued emotionlessly:
"One other matter at this time. Through our intelligence service I have been warned that a capitalist scientist, Dr. Bendix, has attempted to gain admittance to our headquarters here. It is suspected that Mr. Frank Havens, an enemy publisher, has employed this man.
"A Professor Bendix and an assistant did appear here. I have two reports, neither of them checked sufficiently. One is that these two men escaped. The other is that one of them, presumably Bendix has been killed. I shall send at once a man disguised as Doctor Bendix to visit Mr. Havens in New York. This envoy will remove the publisher. I call for a volunteer."
Instantly, the Phantom's hand was raised in the air and his voice rang out:
"I, Commander Rotz, offer myself for that honor!"
There was an imperceptible silence while the eyes of every officer in the room turned toward him. Then the chilling voice of the unseen speaker again:
"Commander Rotz is accepted. He will advance at once, at the conclusion of this meeting, along the unnumbered gallery next to Shaft 9. He will be met. That is all, gentlemen. I, the Imperator, have spoken!"
The Phantom's pulse pounded wildly. He out-stared the eyes watching him, turned quickly and strode out of the barrack cavern, the Imperator's icy words ringing in his ears:
"Advance along the unnumbered gallery."
He would be met.
Chapter Ten.
Horror Cave
Van was gripped by the first real hope of unmasking the power-mad genius behind the Invisible Empire. It quickened his senses, keyed him to alertness.
Not once since he had tricked his way into this maze of subterranean passageways had he been able even to guess at the position of the headquarters of the organization. It would have been impossible to track out the black, labyrinthian corridors of this vast series of connected mines and expect to stumble upon the center of the hooded society.
Nor had he heard anyone except Kag mention so much as the existence of a leader. He suspected none of the robed members or the guards had ever seen the Imperator face to face. There seemed to be some unwritten law against speaking his name.
That was the most baffling phase of this strange underground hunt—the utter and impregnable silence of the members.
The Phantom had considered Vonderkag as a suspect, but the hunchback scientist seemed too excitable, too unstable to govern such a ruthless association of men. Yet, apart from Kag, who was there, of all those masked and hooded members, that he could challenge as being the Imperator? A single such open attempt would only end in his immediate death.
The fifty masked officers who had attended that cryptic meeting in the cavern barrack were automatically eliminated as ultimate Imperator suspects, for that cold, emotionless speech had been delivered from some point outside that underground chamber.
Van had thought of trying to escape from this subterranean warren, to contact Havens and get help. He'd have to get out and warn the publisher, after this last threat. But to have these tunnels surrounded by police or soldiers would be useless. The Invisible Empire would only fade deeper into the mines and emerge at will from a hundred different exits.
He was stopped by two guards at the entrance to the tunnel leading off from the cavern that had the concrete walled water door of steel. They let him through at mention of the name Commander Rotz.
He went on alone, his flashlight outlining the earth walls of the sharply rising passage.
The tunnel curved several times, and ended at an iron door that was unlocked. He swung it open, found that it was the entrance to an elevator. The car was empty.
Van stepped into the cage, closed the iron door, and tried the operating lever. The elevator would not lower, but it went up rapidly when he reversed the control.
So far as he could determine, there were no stage landings until the car stopped of its own accord. He opened the door again, stepped out into a short corridor.
Two more guards in robes, masks and hoods, stood before the only exit, a narrow steel door set in a wall of cement at the end of the passage. There was an electric battery lamp over their heads.
The Phantom advanced, gave his name again. A key jangled in the lock, and the door swung open for him. He stepped through the opening into a lighted room of solid white concrete, heard the door close and the lock click behind him.
An odor of disinfectant and medicine permeated the place which was a combination surgical ward and operating room. Against one wall was a glass cabinet