The Invisible Death ♦ Astounding Stories

With night-rays and darkness-antidote America strikes back at the terrific and destructive Invisible Empire. Excerpt “You speak," said Von Kettler, jeering, "as if you really believed that you had the power of life and death over me."
The Superintendent of the penitentiary frowned, yet there was something of perplexity in the look he gave the prisoner