"The Eye of Allah sees--it has warned--now it will destroy. The day of judgment is at hand. The battleship _Maryland_ is at anchor in the Hudson River at New York. No more shall it be the weapon of a despot government. It will be destroyed at twelve o'clock on September fifth."

"Wild talk," said the Chief, "but today is the fourth. The Commander of the _Maryland_ has been warned--approach by air or water will be impossible. I want you men to patrol the sh.o.r.e and nail this man if he shows up. Lord knows what he intends--bluffing probably--but he may try some fool stunt. If he does--get him!"

Eleven-thirty by the watch on Robert Delamater's wrist found him seated in the bow of a speed-boat the following morning. They patrolled slowly up and down the sh.o.r.e. There were fellow operatives, he knew, scores of them, posted at all points of vantage along the docks.

Eleven forty-five--and the roar of seaplanes came from above where air patrols were-guarding the skies. Small boats drove back and forth on set courses; no curious sight-seeing craft could approach the _Maryland_ that day. On board the battleship, too, there was activity apparent. A bugle sounded, and the warning of bellowing Klaxons echoed across the water. Here, in the peace and safety of the big port, the great man-of-war was sounding general quarters, and a scurry of running men showed for an instant on her decks. Anti-aircraft guns swung silently upon imaginary targets--

The watcher smiled at the absurdity of it all--this preparation to repel the attack of a wild-eyed writer of insane threats. And yet--and yet-- He knew, too, there was apprehension in his frequent glances at his watch.

One minute to go! Delamater should have watched the sh.o.r.e. And, instead, he could not keep his eyes from the big fighting-ship silhouetted so clearly less than a mile away, motionless and waiting--waiting--for what? He saw the great turreted guns, useless against this puny, invisible opponent. Above them the fighting tops were gleaming. And above them--

Delamater shaded his eyes with a quick, tense hand: the tip of the mast was sparkling. There was a blue flash that glinted along the steel. It was gone to reappear on the fighting top itself--then lower.

What was it? the watching man was asking himself. What did it bring to mind? A street-car? A defective trolley? The zipping flash of a contact made and broken? That last!

Like the touch of a invisible wire, tremendously charged, a wire that touched and retreated, that made and lost its contact, the flashing arc was working toward the deck. It felt its way to the body of the ship; the arc was plain, starting from mid-air to hiss against the armored side; the arc shortened--went to nothing--vanished.... A puff of smoke from an open port proved its presence inside. Delamater had the conviction that a deadly something had gone through the ship's side--was insulated from it--was searching with its blazing, arcing end for the ammunition rooms....

The realization of that creeping menace came to Delamater with a gripping, numbing horror. The seconds were almost endless as he waited. Slowly, before his terrified eyes, the deck of the great ship bulged upward ... slowly it rolled and tore apart ... a mammoth turret with sixteen-inch guns was lifting unhurriedly into the air ... there were bodies of men rocketing skyward....

The mind of the man was racing at lightning speed, and the havoc before him seemed more horrible in its slow, leisurely progress. If he could only move--do something!

The shock of the blasted air struck him sprawling into the bottom of the boat; the listener was hammered almost to numbness by the deafening thunder that battered and tore through the still air. At top speed the helmsman drove for the shelter of a hidden cove. They made it an instant before the great waves struck high upon the sand spit.

Over the bay hung a ballooning cloud of black and gray--lifting for an instant to show in stark ghastliness the wreckage, broken and twisted, that marked where the battleship _Maryland_ rested in the mud in the harbor of New York.

The eyes of the Secret-Service men were filled with the indelible impress of what they had seen. Again and again, before him, came the vision of a ship full of men in horrible, slow disintegration; his mind was numbed and his actions and reactions were largely automatic.

But somehow he found himself in the roar of the subway, and later he sat in a chair and knew he was in a Pullman of a Washington train.

He rode for hours in preoccupied silence, his gaze fixed unseeingly, striving to reach out and out to some distant, unknown something which he was trying to visualize. But he looked at intervals at his hand that held three metal pellets.

He was groping for the mental sequence which would bring the few known facts together and indicate their cause. A threat--a seeming spying within a closed and secret room--the murder on the ninth floor, a murder without trace of wound or weapon. Weapon! He stared again at the tangible evidence he held; then shook his head in perplexed abstraction. No--the man was killed by unknown means.

And now--the _Maryland_! And a visible finger of death--touching, flashing, feeling its way to the deadly cargo of powder sacks.

Not till he sat alone with his chief did he put into words his thoughts.

"A time bomb did it," the Chief was saying. "The officials deny it, but what other answer is there? No one approached that ship--you know that, Del--no torpedo nor aerial bomb! Nothing as fanciful as that!"

Robert Delamater's lips formed a wry smile. "Nothing at fanciful as that"--and he was thinking, thinking--of what he hardly dared express.

"We will start with the ship's personnel," the other continued; "find every man who was not on board when the explosion occurred--"

"No use," the operative interrupted; "this was no inside job, Chief."

He paused to choose his words while the other watched him curiously.

"Someone _did_ reach that ship--reached it from a distance--reached it in the same way they reached that poor devil I left at room nine forty-seven. Listen--"

He told his superior of his vigil on the speed-boat--of the almost invisible flash against the ship's mast. "He reached it, Chief," he concluded; "he felt or saw his way down and through the side of that ship. And he fired their ammunition from G.o.d knows where."

"I wonder," said the big man slowly; "I wonder if you know just what you are trying to tell me--just how absurd your idea is. Are you seriously hinting at long-distance vision through solid armor-plate--through these walls of stone and steel? And wireless power-transmission through the same wall--!"

"Exactly!" said the operative.

"Why, Del, you must be as crazy as this Eye of Allah individual. It's impossible."

"That word," said Delamater, quietly, "has been crossed out of scientific books in the past few years."

"What do you mean?"

"You have studied some physical science, of course?" Delamater asked.

The Chief nodded.

"Then you know what I mean. I mean that up to recent years science had all the possibilities and impossibilities neatly divided and catalogued. Ignorance, as always, was the best basis for positive a.s.surance. Then they got inside the atom. And since then your real scientist has been a very humble man. He has seen the impossibility of yesterday become the established fact of to-day."

The Chief of the United States Secret Service was tapping with nervous irritation on the desk before him.

"Yes, yes!" he agreed, and again he looked oddly at his operative.

"Perhaps there is something to that; you work along that line, Del: you can have a free hand. Take a few days off, a little vacation if you wish. Yes--and ask Sprague to step in from the other office; he has the personnel list."

Robert Delamater felt the other's eyes follow him as he left the room.

"And that about lets me out," he told himself; "he thinks I've gone cuckoo, now."

He stopped in a corridor; his fingers, fumbling in a vest pocket, had touched the little metal spheres. Again his mind flashed back to the chain of events he had linked together. He turned toward an inner office.

"I would like to see Doctor Brooks," he said. And when the physician appeared: "About that man who was murdered at the hotel, Doctor--"

"Who died," the doctor corrected; "we found no evidence of murder."

"Who was murdered," the operative insisted. "Have you his clothing where I can examine it?"

"Sure," agreed the physician. He led Delamater to another room and brought out a box of the dead man's effects.

"But if it's murder you expect to prove you'll find no help in this."

The Secret Service man nodded. "I'll look them over, just the same,"

he said. "Thanks."

Alone in the room, he went over the clothing piece by piece. Again he examined each garment, each pocket, the lining, as he had done before when first he took the case. Metal, he thought, he must find metal.

But only when a heavy shoe was in his hands did the anxious frown relax from about his eyes.