"How did you manage to get away?" he asked. "I was sure—I thought—when they dragged you out of the tower room I wouldn't see you again—"

Rapidly Dex gave an account of his ordeal in the torture chamber, telling Brand in a few words how he had attempted to win free of the Rogans, how he had almost succeeded, only to be caught again and clamped to the death-plate on the wall.

"But just as the big fellow was about to cook me for good and all," he concluded, "something happened to the current, and to the gravity at the same time—"

"That was when I pulled the lever in the dome building!" exclaimed Brand.

He told of what had befallen him in the Rogan power-house. "That lever, Dex!" he said swiftly. "It's the keynote of the whole business. It absolutely controls the pull of gravity, and Lord knows what else besides. If we could only get at it again! Perhaps we could not only shut it off so that Jupiter's pull would function again, but also reverse the process so its gravity would be increased! Think what that would mean! Every Rogan in the red empire stretched out and immovable, possibly crushed in by his own weight!"

"It's a wonderful thought," sighed Dex; while Greca's eyes glowed with a sudden hope for her enslaved race, "but I don't see how we could ever—"

He stopped; and glanced in alarm down the passage behind them. Greca and Brand, hearing the same soft noise, whirled to look, too.

Far down the passage, just sneaking around the bend, was a group of Rogan guards, each armed with a death-tube.

"Back to the pen!" cried Brand.

He slid the bolt, and jerked the door open. They rushed into the walled enclosure again, the slamming of the door behind them cutting off the enraged squeals of the Rogans.

"This isn't going to mean anything but a short delay, I'm afraid," said Brand, clenching his fists in an agony of futility. "They'll be in here in a minute, and get us like trapped rats."

"Not before we get a lot of them," said Dex grimly.

"But that isn't enough, man! We don't want to die, no matter how decently we do it. We've won free, and stayed free this long; now, somehow, we've got to reach our ship and get back to Earth to warn them of the danger that hides here for our planet!"