The Sign at Six

A scientifically trained young man, Percy Darrow, returns to urban life and becomes drawn into a baffling series of phenomena that silence and alter the city, producing ghost-like tableaux and outbreaks of panic. Teaming with a municipal boss and other investigators, he formulates a theory and stages experiments to identify an unseen cause that brings cold, paralysis, and rising confusion. The narrative traces their methodical pursuit, the escalation of hazards, the confrontation with the unknown agency, and the eventual dispelling of the eerie influence, followed by an account of consequences and aftermath.