A cinematic cover conceals a sinister plot as Mr. Verloc, a seemingly ordinary businessman, secretly leads a gang of saboteurs in London. His innocent-looking movie theater serves as a front, with his wife and her teenage brother unaware of his true activities. Meanwhile, Scotland Yard dispatches an undercover detective to a neighboring shop to gather intelligence on the gang's nefarious plans.

Sabotage
A Scotland Yard detective goes undercover to stop a ring of saboteurs from detonating a bomb in London, but their secret is soon discovered, threatening to derail the entire operation.