After half an hour the N.P.A.'s voice wasn't so sure. He had given Jon three more pills, had tried all the devices at the command of the largest neural-clinic in the Empire without the slightest effect. Jon Saxon continued to regard the N.P.A. with a half hidden gleam of amusement in his dark gray eyes.
The neuro-psychoanalyst sat back, mopped his perspiring face with his handkerchief. "It's no use!" he said in a strained voice. "He can't be hypnotized!"
"I could have told you that," replied Saxon. "Do you think I haven't tried to have the block broken before?"
The N.P.A. swore and got to his feet. "Well, why didn't you say so?" he shouted. It was the first time Saxon had ever seen him lose his temper.
"Because these gentlemen have been suspicious of me." He indicated Murdock and Villainowski. "If I had offered any objections to being hypnotized, they'd have been sure that I was afraid to."
All at once, Saxon experienced the peculiar tingling in scalp and skin that warned him the alien creatures, whom he had met in the street, were present. He couldn't possibly be mistaken. Once having experienced that peculiar inhuman feel it was not to be forgotten or confused.
Not only were they invisible, but neither doors nor walls seemed to offer any resistance to them.
"Who are you?" he concentrated, but his thought met that strange mental barrier. There was no answer.
He realized that the three men were watching him with a curious tenseness.
Suddenly the N.P.A.'s jaw dropped. An expression of complete astonishment lit up his face. "I've got it! I've got it!" he cried.