"But who detected them, if they were invisible?"
"We don't know. Oh, Joel, that's why it's so important for you to obtain Priscilla Cameron's confidence. Women are—are indiscreet with their lovers."
Joel looked shocked.
"But Joel, she'll buy you anyway! You'll have the run of the palace. Slaves hear things and see things no one else can!"
She paused, saw him wavering, hurried on. "We're blind without someone close to the governor. The Thinkers are worried. They're holding off, afraid to give the word that'll start the revolt."
"How near is it?" he asked.
"We're ready to strike. The Unfit have stolen arms, built secret laboratories in the jungle. But we don't dare go ahead until we find out how much the governor knows. We may be blundering into a trap."
Joel drew a deep breath. "All right," he agreed reluctantly, "I'll try. How do I pass my information on—if I get any?"
She looked relieved. "The Thinkers will contact you."
A yell from outside their prison interrupted her. Somebody blew a whistle. A chorus of shouts, muted by the thick walls, reached them faintly.