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In a cramped laboratory filled with humming equipment, engineer Ed Bronson is testing a newly‑crafted phosphor tube meant for brighter television screens. When the crystal inside begins to vibrate under an electron beam, it produces a low, almost whisper‑like sound that defies ordinary explanation. Connecting a contact microphone, Bronson hears a chaotic chorus of whines and, buried within, the faint, unintelligible voice of a woman speaking English. The oddity is both scientific curiosity and an unsettling mystery.
Obsessed with isolating the source, he tweaks magnetic fields and amplifiers, hoping the voice will become clear enough to identify. If the phenomenon proves to be a hidden transmission, it could revolutionize communication—or expose secret channels used by covert agents. Bronson’s experiments quickly attract the attention of those who would exploit any breakthrough in eavesdropping technology. The story follows his race against time to understand whether this phantom broadcast is a breakthrough, a trap, or something far stranger.
Language
en
Duration
~3 hours (212K characters)
Publisher of text edition
Project Gutenberg
Original publisher
United States: Better Publications, Inc.,1948.
Credits
Greg Weeks, Mary Meehan and the Online Distributed Proofreading Team at http://www.pgdp.net
Release date
Sep 4, 2022
Rights
Public domain in the USA.
Subjects

1911–1981
A pioneering Golden Age science fiction writer, George O. Smith combined an electronics engineer’s knowledge with stories about communication, invention, and life in space. He is best remembered for the inventive Venus Equilateral series, which began with his 1942 debut in Astounding Science-Fiction.
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