There was a way of finding out. My new assistant had mentioned it. I could take each of these computers and shield the wires that served as antennae, transmitting my thoughts and receiving those of Mintner. But how could I be sure that he would unshield my antenna wires once he had covered them and severed my contact with him? It was a risk I was going to have to take. I started to tremble again. Somewhere in this storeroom, in one of these sepulchral niches, was _I_! I had to know which one. I went back to the lab and returned with a kit of small tools. My fingers were calm and sure now. My trembling was gone. I took the front panel off the first computer near the door. The short wires from the dialectric mix to the tube bank were in plain view, easily accessible. I stood there studying them, considering and discarding a dozen plans for shielding them so they could be quickly unshielded again. Finally I decided on a procedure that was as foolproof as any I could possibly devise. Rubber pads, with aluminum plates to be put over the rubber. After that it was merely a matter of carrying out the routine. I built the rubber shields and the aluminum ones. I fitted them carefully over the wires on the first machine, then as carefully took them off. Nothing had happened. I did the same to the second machine. I was on the fifth machine when the storeroom door opened and my two assistants announced they were leaving for the day. I glanced at my watch. It was five-thirty. "Okay," I answered. "See you in the morning." They closed the door. I started taking off the panel of the sixth computer. It was getting a little stuffy in the storeroom. I set the panel down carefully and opened the lab door and a window. Then I placed the rubber shield on the wires. I picked up the aluminum shield plates and started to cover the rubber shielding with them. Instead, I laid them down again. I would go across the street to the cafe and have something to eat before going ahead. I entered the lab. It was dark. A storm must be coming up for it to get dark so soon and so suddenly. I switched on the lights and unconsciously glanced at my watch to make sure of the time, and froze in surprise. It was nine-thirty. I reviewed my movements. My assistants had said goodnight about five minutes ago. I had glanced at my watch then, and it was five-thirty. Now it was nine-thirty. After they had gone I had placed the rubber covers over the wires, then started to put the aluminum shields on--and changed my mind.