Those who listened closely said the voice changed them. A junior analyst found himself waking at precisely the same time every night for a week and writing letters he never sent. A retired archivist dug through boxes he had labeled and relabeled for decades, finally opening one marked useless and finding a slim photograph of a coastal town he’d never visited but knew intimately in memory. The photograph had 4742903 scrawled on the back in ink that matched the color of the sky.