Produced by the BBC and making its home video debut in North America on Acorn TV, The Secret Agent is a three-episode adaptation of Joseph Conrad's tale about The Great Game and its human cost. Toby Jones (Captain America's Armin Zola) stars as Anton Verloc, the owner of a pornography shoppe in London's Soho who moonlights as an anarchist agitator who moonlights as a Russian spy. His chief, the Russian ambassador (David Dawson) is tired of paying their hapless agent for inaction. The international anarcho-communist movement is threatening the stability of governments across Europe, and thus the ambassador wishes to provoke Scotland Yard into bringing its full weight against England's would-be revolutionaries. Verloc is assigned to frame his anarchist cell with a heinous crime: the bombing of the Greenwich Observatory.
What follows is a descent into an utterly bleak moral landscape of madness and ideology manipulated by damnable political forces. The anarcho-communists are a futile lot of bickering "old men" who talk of revolution while wasting their lives on petty seductions. Only one offers any help to Verloc, known only as "The Professor" (Ian Hart), a nihilistic maniac frustrated with the cell's unwillingness to actually get its hands dirty. The cell is under the watch of Chief Inspector Heat (Stephen Grahame), who has nothing but disdain for their foolish hobby... Until he discovers that The Professor's wired up overcoat has turned him into a walking bomb. That is his first clue that there is more going on than impotent political bloviating.
Essential to Verloc's plot is his brother-in-law Stevie (Charlie Hamblett). Believing Verloc to be a decent and simple man, Winnie (Vicky McClure) married him for security rather than love. The security he provided allowed her, her mother, and her brother to get away from the abusive hand of her father. This was especially important for Stevie, who suffers from a developmental disability. The cowardly Verloc, who cannot bear to commit an actual act of terrorism, sees in Stevie an easy dupe to commit the terrible act. Yet the plan goes awry, and the lives of everyone spiral downwards to the abyss.