Commencing with the Stooges portraying traveling salesmen, their unsuccessful attempts to market the "Miracle Reducing Machine" prompts their continued journey in dire need of funds to meet rent obligations.

Graves, en route to Washington, D.C., entrusts his eerie mansion to the Stooges, intending to return after testing his revolutionary death ray machine.

The Stooges become further agitated by unexplained cream pie projectiles, seemingly propelled by an enigmatic pie-throwing apparition.

Dunkfeather initially claims responsibility but is contradicted when a pie suddenly materializes, casting doubt on his account.

Filmed on July 17–21, 1942, Spook Louder was one of several World War II-era Stooges shorts that engaged in propaganda against the then-enemy Japanese, with others including No Dough Boys, Booby Dupes and, notably, The Yoke's on Me.