Sandra said despairingly, "But I don't see how it can profit us to join forces with dull-witted slaves—"

"Slaves, yes! But they are dull-witted no longer. Generations have erased the madness from the Underlings' brains. The Masters hold them in subjection now only because they have superior armament. The golden force-ray, for one thing.

"But rebellion is stirring amongst the Underlings. Sert is one of the leaders of a secret rebel party. He was stealing through the building, seeking new converts, when he accidentally entered our cell."

Some of Larry's excitement communicated itself to the girl. She said, "But what are we going to do?"

"Sert," Larry told her, "taught me how to open the doors around this joint. It's not hard when you get the hang of it. Every wall has a door-lock. The locks work on a network of selenium cells imbedded in the metal; these are controlled automatically by body-radiation emanating from the fingertips. Ever hear of anything like that before?"

Sandra said dazedly, "Mitogenic radiation!"

"Yes. That's what Sert called it, too. Well, all you have to do is discover the proper way to touch the doors. The right combination and bingo! If your fingers are sensitive, you can do it without much fumbling. I learned easily."

"You still haven't told me what we're going to—"

"We're pulling out of this coop—tonight! In the machine shops, Sert has a gang of a half hundred rebels. We will join them."

"And then?"