“That door will only operate when I arrange it for you to enter. It is connected here.” He pointed to a framework on the wall.
“When you come through the passage,” he continued, “everything is arranged for your safety. I am expecting you. But the moment that you arrive here, I change the plans.
“The passage is filled with traps. Even The Shadow could not escape them.”
“Suppose he followed after me.”
Loo Look laughed. He pointed to a row of lights.
“Those showed me just where you were,” he said. “After you had passed a certain spot, I let a steel sheet slide down.
“If The Shadow came behind you, he must still be on the other side. But he is not there. Another light would have indicated his presence.”
“Hm-m-m,” said Tiger Bronson. “You’ve got it all fixed like a block-signal system on a railway.”
“Exactly. Only more elaborate.”