Harry read these instructions over two or three times, then the ink faded from view. This reminded him that he must start immediately. He left the inn and walked up the avenue, on the side of the street away from Bingham’s house.
His watch showed quarter of eight when he arrived. He had less than a minute to wait. He saw a man come quietly from the door, and start walking rapidly toward the village. He decided that it must be Jenks, the old lawyer’s servant.
Harry slipped across the street and tried the door. It opened. Jenks must have left it unlocked. The floor was heavily carpeted, and the stairs, likewise.
Harry reached the study without misadventure. The room was unlighted, but he found a lamp on the table and turned it on. The room was a small one. It contained a desk, a bookcase, a filing cabinet, and a radio. There was a steel door in one corner. The shade of the window had been drawn.
It was nearly ten minutes to eight. Harry pressed the switch on the radio, and turned the dial until he found Station WNX, which he recognized by the popular comedy program that was a nightly feature from seven forty-five until eight o’clock.
Harry drew the box from his pocket, broke the seals, and brought three objects into view.
One was a peculiarly shaped key; in fact, Harry had never seen a similar key before.
The second article was a small black bottle with a screw cap. He took off the cap and found that a sponge was wedged in the neck. Evidently it was there for a definite purpose. So he let it remain.
The third article was a small memorandum pad with a pencil attached. Its purpose was obvious to Harry. He was to take notes of some sort; the pad and pencil had been included in the box to make sure that he would be provided with the necessary materials. The Shadow didn’t miss a trick!
Sitting at the desk, Harry listened to the radio, waiting. He had tuned in carefully so that the sound would not be too loud. He knew that he was alone in the house, yet felt nervous. Less than five minutes remained before it would be eight o’clock. Those minutes seemed as hours.
The comedy number was reaching its conclusion. Harry realized that in his nervous state he had hardly caught a word. He must be careful now, and listen.
A clock downstairs struck eight times, and the sound of its gong startled him. The strokes seemed unduly slow - as though they were minutes apart.
The Modern Dentifrice Program was on the air. Harry had his pencil in hand. What would the announcer say? Curiosity, mingled with nervousness in Harry’s mind.
The announcer was speaking. Harry detected a strange voice. He had listened frequently to this program, but had never heard this particular announcer before.
The voice spoke slowly. In the first sentence, Hairy caught an emphasis that brought a gasp of astonishment to his lips.
The man at Station WNX was stressing certain words, exactly as Harry had heard words stressed over the telephone.
The radio broadcast was bringing a message from The Shadow! A message that would be heard by millions, yet whose true significance was meant for Harry Vincent alone!
His pencil was busy, writing the important words upon the pad.
“We now OPEN our program,” came the slow, carefully modulated voice of the announcer. “Let me remind you that opportunity is at your DOOR. Rely upon a SAFE method to preserve your teeth by using a COMBINATION of dentifrices. SIX thousand FIVE hundred and thirty-SEVEN dentists have endorsed this one method. You may PLACE your confidence in them. Brush your teeth with LIQUID; then with paste.
“When you buy your dentifrice, look for the gold label, which appears ON every SEALED package of Modern Dentifrice.
“If you will send a stamped ENVELOPE to this station, you will receive a COPY of our booklet, ‘Perfect Teeth.’
“You will now hear our nightly program of popular musical NUMBERS.”
The strains of a jazz orchestra burst from the radio. Harry turned off the instrument. He had received his message. Now to consider it.
Harry considered these words on the pad:
“Open door safe combination six five seven place liquid on sealed envelope copy numbers.”
Harry realized instantly that the door he was to open was the steel one in the corner of Ezekiel Bingham’s study. He picked up the key that he had found in the package and tried it. It fitted the lock. He opened the steel door and revealed the safe.
The safe combination - six, five, seven - puzzled him for a moment. In what directions should he turn the dial? Probably left, right, left. He tried it. The safe opened.
Next, he must discover a sealed envelope. There were not many papers in the safe.
Harry picked up one small pile, but did not find the envelope in question. There were three sealed envelopes in the next packet: one of these had sealing wax on the back, and the mark of a signet ring. Evidently this was the envelope.
Harry handled it carefully. He did not even touch the seal.
Going to the desk, he performed an operation which occurred to him as obvious. He inverted the bottle. The sponge became saturated with liquid from within. Harry rubbed the sponge over the entire face of the envelope. The paper became transparent immediately.
There was a single sheet of paper inside the envelope. The paper was now entirely visible. It contained several rows of numbers. Harry realized this must be the original code from which the old lawyer had made the copy to give to Elbert Joyce, that night in the darkened automobile.
He tore the top sheet from his pad; crumpled the paper in his pocket, and quickly transcribed the numbers to the pad. They were meaningless to Harry, but he copied them exactly:
“730-16; 457-20; 330-5; 543-26; 605-39; 808-1; 457-20; 38-14; 840-28; 877-27; 101-13; 872-21; 838- 10.”
He checked the list to make sure he had taken them down correctly. He noticed that the surface of the envelope was less transparent.
Putting the pad in his pocket, Harry carefully straightened the piles of papers, and replaced the envelope where it belonged.
The envelope had dried completely; there was no trace whatever of the liquid which had enabled Vincent to read the hidden message.
He closed the safe and locked the steel door, then gathered up the various articles that he had brought. Turning the dial of the radio to the degree it had been originally, Harry quit the room. His watch showed eighteen minutes after eight.
Leaving the house, he crossed the street, and strolled back toward Holmwood Arms. He heard some one walking rapidly along the street, coming from the opposite direction. Jenks likely, thought Harry, realizing that he had not had many minutes to spare.
Of all his adventures in the service of The Shadow, this had been the most unexpected. The radio announcer at WNX! How had that been arranged? Who was he? The Shadow, himself?
Harry thought of the numbers on the pad. No wonder they had puzzled old Ezekiel Bingham. He pictured Elbert Joyce working over them. Had the cryptogram expert solved their meaning? Well, soon the mysterious numbers would reach The Shadow, and Joyce would be racing against a masterful rival.
Harry found his car at the garage, and drove toward the city. The rest of his work was easy. Back to the Metrolite Hotel, to await further instructions.
“No adventures for another two hours anyway”, Harry mused as he sped along. “But they’ll be coming along sooner or later.”
In this, he was but partly right. He was due for excitement much sooner than he expected.
The brilliant sign of a gasoline station reminded him that his car needed more fuel. The gauge showed less
