A calm, scene-led investigation of how “Demon Lover” from CBS Radio Mystery Theater built fear with silence, close-mic voices, and exact foley. This cultural history documentary follows the nineteen-seventies radio revival, E. G. Marshall’s steady hosting, and the production discipline that turned a late-night hour into a lasting audio drama touchstone. We trace clock sense, room mapping, restraint in music, and ethical framing, then translate those lessons for today’s earbuds and podcasts. Keywords: cultural history, investigative discovery, radio horror, audio drama, CBS Radio Mystery Theater, E. G. Marshall, Himan Brown, sound design, archival audio, nineteen seventies media.