Rick Mason's ship was still high over Mordarga, coming in for a landing, when the cry for help sounded in his audio phones. Rick frowned, reached to the control panel to turn up the amplification—then realized that the voice had not come over the audio after all. It had spoken in his mind. Help! Rick, they've caught me! There was urgency in the mental cry. Instantly, Mason sized up the situation. It was his partner, Klon Darra, the Venusian—the other half of this mentally-attuned Solar System in