They slept till a slight, but dreadfully familiar hissing woke them up. Then Josh, catlike, scrambled to his feet. He jerked a phosphorus pellet from his pocket and dashed the damp thing to the floor. A ghastly bluish light blared out.
They saw why they had heard the sounds of water. They were in the very place, above the end of the water-filled tunnel-bore, where they had started from! There was the place where they had been captured. There was the fissure through which Smitty and Josh had come!
Between themselves and the fissure, which represented the sole way of escape, was the thing that had been hissing.
The greenish pillar of mist. The little cloud in which walked the Rain God, striking down humans with lightning bolts.
Nellie cried out, with the sound of her voice echoing loudly in the confined space. The pillar of greenish mist, towering to the ceiling, came slowly, methodically, toward them.
CHAPTER XIII
Frozen Cure
Almost at dawn, the ammonia coils had come by plane to the construction camp. With every man working at top speed, Benson placed the coils.
He had thoroughly explored the water-filled portion of the bore, acting like a diver with his nose-clip mask and oxygen bladders, and had found where the water came from. It was from a narrow but long rent in the rock at the very end.
Into the fissure went the coils.
“We’ll freeze the water into a solid plug of ice that will keep any more from getting into the workings,” said The Avenger. “Then we can pump the rest out.”
“But we may be freezin’ Smitty and Nellie and Josh into ice plugs, too,” moaned Mac. “If they’re still alive, as ye seem to think.”
“I’ve told you I heard a shot in there yesterday afternoon,” said Benson. “People don’t shoot at corpses. They must have been alive then. It’s just possible they still are.”
Mac said nothing. He had heard no shot; but he knew the uncanny sharpness of The Avenger’s hearing.
Pipe had been laid from the water-pocketed bore to the outside. Pumps were running with deep and sonorous rhythm, pumping out the water, and pumping ammonia around the coils in the fissure.
Ammonia works fast. The ice was forming in the narrow fissure very shortly. Soon there was a rough-ended plug of it jamming the place where the water was coming from, and there was a three-foot space under the rent in the top of the roof instead of a space of merely a few inches.
Benson and Mac went toward that. Enough water had been taken out to show that, if the ones they were after had gone anywhere out of the bore, it must have been up there.
The two hadn’t gone half the distance when The Avenger held up his hand for silence. That acute hearing of his was bringing him sounds that Mac couldn’t hear at all.
For an instant he paused that way, then he began to race as hard as he could toward the fissure — but keeping the noise of his passage through the water down as much as he could.
Mac was fast on his feet; but the flashing speed of the gray steel figure of a man he called his chief left him ten yards behind. But as Mac got to the fissure, with Benson already halfway up its thickness, he too heard what Benson had heard.
There was a hissing up there like that of a dozen deadly serpents coiled to spring. The sound made the shivers rasp up and down the Scotchman’s spine.
The Avenger’s white, paralyzed face showed above the top of the rift, like the face of a figure in a waxworks. His pale, infallible eyes took in, at a glance, a picture to haunt the memory forever.
At the opposite wall of a little cave from the rift, were Smitty and Nellie and Josh, illuminated by the last of Josh’s phosphorus pellets. Nellie was half-behind Smitty’s giant bulk. Josh was a little to one side, crouched in a fighting posture.
Smitty was to the fore, with his great arms half-extended, and his body leaning forward for a desperate charge at a pillar of greenish vapor about fifteen feet through and towering to the rock roof.
The pillar was within ten feet of the three, and advancing at a steady pace. From its swirling, misty heart was coming the hissing sound.
“Chief!” yelled Nellie, seeing the white, still face and the deadly colorless eyes. Next instant she bit her lip in a frenzy for having given Benson’s sudden presence away. But it made no difference.
The Avenger had Mike in his hand. The little silenced gun seemed like a pea shooter as a weapon with which to attack this supernormal thing that killed as if with lightning bolts. But the hand that clutched it made it a great deal more effective than it looked.
Mike whispered, and a slug went to the heart of the little green cloud. There was another spat, and another and another, as the four shots in the small cylinder went into the mist.
Trying to harm the Rain God with bullets! Trying to drive a thing like that away with lead!
Four shots went into the mist. In answer to two of them, from the heart of the greenish vapor came brilliant blue flares, like lightning flashes. As if the god were striking back: lightning bolts to bullets.
And then the pillar began to retreat toward one of the tunnels leading out of the small cavern!
Mac and Josh and Smitty and Nellie watched the slow retreat with bulging eyes. The god, it seemed, had been driven off with human weapons, with four small slugs from the special .22!
Smitty leaped toward the retreating pillar of mist, lips curled back from his teeth, plainly intending to charge in and try to get his hands on whatever was in the fog.
Benson’s voice came as a whiplash.
“No!”
Smitty stopped, and stared at the pale, dead face of his chief, showing in the last dying flare of Josh’s pellet.
“Down the fissure, all of you,” said Benson, in a tone that was low but no less commanding.
Smitty and the others reluctantly saw the mist fade from sight down the tunnel darkness. They followed Benson back down the fissure to the tunnel bore. The water was only knee-deep down there, now.
“Why didn’t you let me charge the thing?” asked the giant, still furious at his lost chance.
The pale, inexorable eyes of The Avenger stared at him without, it seemed, really seeing him.
“A god,” said Benson, “might have more than two lightning bolts in his quiver. And you’re much more useful living than dead.”
After the stalking terror at Mt. Rainod, the city streets of Chicago seemed safe and sane and humdrum. But when Benson had traveled through them from the airport, next day, to the offices of the Central Construction, he found — stalking terror.
The three partners, Crest and Fyler and Ryan, were gray-faced with worry and fear.
They faced Benson over the little conference table with gaze questioningly on the dead, white face and the brilliant, colorless eyes.
The Avenger reported, quietly, impassively, what had happened. Crast nodded. He seemed the strongest and most unconquerable of the three.
“It’s about what Todd has reported to us, only more complete,” he said. “The idea of the ammonia coils was good.”
“Not good enough,” said Ryan shakily. “It will take more than that to keep us going. I got hopeful when the bore went so fast with the fire-and-water method of cracking into the mountainside. But water! That’s the worst thing that could happen. We’ll go brankrupt on this, I tell you!”
Fyler shook his head. He was staring hopefully at Benson. The one man of the three partners who was an indoors worker and who hadn’t had actual construction experience, he seemed best able to judge men swifdy and correctly.
“If anyone can save us,” he said, “Mr. Benson can. I feel quite confident that everything will be all right.”