They rode uptown side by side. Brent leaned on the railing while Di Costa remained fixed in his strange trance. The note in Brent's hand was tangible evidence that his suspicions had some basis in fact. As he examined it again, he was aware of an undefinable tingling in his hand. The note seemed to be vibrating shaking free from his hand in some unknown way. Under his startled gaze it glowed suddenly— and disappeared! One instant he had held it, the next his hand was empty.
He leaped back in surprise — passing through the space formerly occupied by Di Costa. Gone — while he had been studying the note! Leaning over the rail he had a quick glimpse of the stiff figure entering the Central Park Skyport. Cursing himself for his stupidity, Brent changed lanes and raced back to the Skyport entrance.
His luck still held. Di Costa was on the outgoing aircab line. It would take him at least ten minutes to get a cab this time of day. With a little speed and a few greased palms Brent could rent a Fly-Your-Own before the other man was airborne.
Shortly after, the orange-and-black cab flashed up from the takeoff circle followed closely by Brent's blue helio. The two aircraft flew north and vanished in the distance over the Hudson.
The aircab stayed at the ten-thousand-foot level. Brent cruised at eight thousand, lagging slightly behind, keeping in the blind spot of the other ship. The entire affair was moving too fast for his peace of mind. He had the feeling that he was no longer a free agent, that he was being pushed into things before he decided for himself.
He suddenly felt elated. The strange symbol on the note, the note that disappeared in such an inexplicable fashion, proved the existence of alien hidden forces. Every mile that rushed under his plane brought him closer to the answer. He didn't fear death — it was no longer a stranger to him. The moments of time left to him might be made more satisfactory if he ferreted out this secret. He smiled to himself.
Fifteen minutes later the two ships grounded at the Municipal Sky-port in Poughkeepsie. Brent parked the ship and followed his quarry down to the street level. Except for a certain stiffness in his movements, Di Costa seemed normal. He walked quickly and turned into an office building before Brent could catch up with him.
Throwing discretion aside; Brent broke into a run. He turned into the lobby just as the elevator door closed. He pressed the call button but the car continued to rise. The indicator stopped at 4, then slowly sank down again.
He was too close to the end to even consider stopping now. He stepped into the self-service elevator and pressed 4. The door closed and the car began to… descend!
With the realization that he was trapped came the knowledge that there was very little he could do about it. Just wait and see who — or what — might be outside the car when the door opened!
The elevator dropped down to a level that must have been far beneath the basement floor. The door slid slowly back.
The room was not what he had expected. Not that he had any idea of what there would be; it was just — just that this room was so ordinary!
Ordinary — except for the side wall. That was an impossibility. It was a glass wall looking into a vast tank of swirling water — only there was no glass! It was the surface of the ocean standing on its side. He felt himself drawn into it, falling into it.
The sensation vanished as the wall suddenly turned jet black. He became aware for the first time that he wasn't alone in the room. There was a girl behind a chrome desk. A lovely girl with straight bronze hair and green eyes.
"An untrained person shouldn't watch that machine, Mr. Dalgreen; it has a negative effect on the mind. Won't you please step in?"
His jaw dropped. "How do you know my name? Who are you? What is this pi—"
"If you'll be seated, I'll be with you in a moment."
Brent saw that the elevator would stay here until he got out. He stepped into the room, and the door sliding shut behind him didn't help his morale any. He was into it up to his neck, and the other team had taken complete charge. He sat.
The redhead pulled the sheet of paper out of her typewriter and pushed it into the strange wall. It once more had the undersea look. Brent kept his eyes averted until she turned to him with a slight frown furrowing her forehead.
''You have been very interested in Arthur Di Costa's activities, Mr. Dalgreen. Perhaps there are some questions you would like to ask me?"
"That, lady, is the world's best understatement! Just what happened to him today?. . And what is this place?"
She leaned forward and pointed. "You're responsible for Mr. Di Costa's visit here today. You were observed following him, so we brought him in, in the hope that you would come also. The message he received was a code word designed to trigger an automatic response planted in his mind. He came directly here, controlled by the posthypnotic suggestion."
"But the note!" he exclaimed.
