Lucky Starr and the Oceans of Venus

<p><b><i>Lucky Starr and the Oceans of Venus</i> is the third novel in the Lucky Starr series written by the legendary Isaac Asimov, author of <i>I, Robot</i>, <i>Foundation</i>, and the Galactic Empire series. The Lucky Starr series was originally published under the pseudonym Paul French.</b></p><p><i>From a distance it seemed an emerald green, fairyland bubble!</i></p><p>Aphrodite, the largest city on Venus, deep beneath the planet's sea. Earthmen had established an incredible civilization, but now it is threatened by an unknown force preying on men's minds.</p><p>"Bigman's head snapped back at a sudden new and strange sound. It was a voice, flat, without intonation. It said, "Do not tamper with your machine of far-reaching sound. We do not wish it."</p><p>Bigman turned. His mouth fell open and, for a moment, stayed so. He said, "Who said that? Where is it?"</p><p>Lucky said, "Easy, Bigman. It was inside your head."</p><p>How will Lucky Starr fight off an enemy that can get inside people's heads?</p>