Old-Era Spy Shadows: Codename Unspeakable

In a dieselpunk world where “secrets are curses and intelligence is contamination,” the protagonist is the only person immune to mental contamination. He infiltrates the imperial military, which worships evil gods, and gains intelligence and power by reading classified files that would drive ordinary people to mutate. On the brink between sanity and madness, he plays a high-stakes undercover game.