"Hush, Lana! Don't think of it now! Wait!"
Sual Av had been searching the bodies of the two slain guards. The Venusian hastened back now to Thorn's side.
"John, there's no wave-key on those guards,” he reported anxiously. “How are we going to get Lana out?"
"We'll have to break through this cell-door somehow!” Thorn exclaimed urgently.
"Break through an inertrum door?” said Gunner Welk incredulously.
A quick examination of the door justified the big Mercurian's doubt. The heavy inertrum of the door would resist even their atom-pistols. And the wave-lock was wholly invulnerable.
"We've got to get her out some how!” Thorn cried.
"John, listen to me,” said Lana quickly. “You can't get me out. But you Planeteers can get away, by the way you came. I'll tell you the secret of Erebus, the way to land on that world safely, and you three can get the radite.
"But we can't leave you here, Lana!” Thorn cried desperately. “Just when you and I have found each other—"
"You must!” she declared, her blue eyes bright with purpose. “What is my safety against that of all the inner Worlds?"