At Cleaver University's locked-down spaceport, marine geologist Dr. Frank Harding escorts Arlene Rolf, a gifted micromachinist on a secret diex-energy project, past security barriers built to stop intruders cold. Their strained conversation hints at a past relationship and at the extraordinary precautions surrounding Dr. Benjamin B. Lowry's work, a project so sensitive that even its creators seem trapped inside it. When a mysterious government representative, Mr. Green, and Colonel Weldon arrive, the pressure sharpens: the diex projector is no longer merely an experiment, but a tool tied to a hidden threat. Weldon reveals the terrifying truth behind the project: it was meant to locate a rogue telepath, a master hypnotist and impersonator who has sabotaged human progress for centuries, from the collapse of interplanetary colonization to a recent impossible murder that proved he may still be active. As Lowry and Arlene learn that the projector can amplify telepathic power and shield a mind long enough to find him, they realize they may already be caught in his web. In a tense finale of psychic testing, secrecy, and mental intrusion, Arlene feels herself slipping into a dreamlike state as the diex experiment begins to touch a mind that may be watching from the dark. This edition has been fully restored with modern typesetting, custom cover design.