Abruptly the gate lattice slid aside. Beyond the cubby doorway was the open darkness within the wall. A scuffed path leading inward from the gate showed for a few feet.

I walked over the threshold, with Alan crowding me. The Essen in my coat pocket was leveled. But from the cubby doorway, I saw that the guard was gone! Then I saw him crouching back of a metal shield. His voice rang out.

"Stand!"

A light struck my face—a little beam from a television sender beside me. It all happened in an instant, so quickly Alan and I had barely time to make a move. I realized my image was now doubtless being presented to Polter. He would recognize me!

I ducked my head, yelling: "Don't do that! You frighten me!"

It was too late! The guard had received a signal. I was aware of its buzz.

From the shield a tiny jet of fluid leaped at me. It struck my hood. There was a heavy, sickening-sweet smell. It seemed like chloroform. I felt my senses going. The cubby room was turning dark; was roaring.

I think I fired at the shield. And Alan leapt aside. I heard the faint hiss of his Essen. And his choked, horrified voice:

"George—come back! Run! Don't fall! Don't!"

I crumpled; slid into blackness. And it seemed, as I went down, that Alan's inert body was falling on top of me....