Toby Jones, Vicky McClure and Stephen Graham star in this three-part BBC adaptation of Joseph Conrad's novel. Set in Victorian London, the drama follows Soho shopkeeper Verloc (Jones) as he becomes increasingly involved in espionage and terrorism. Unknown to his wife Winnie (McClure), Verloc is employed by the Russian embassy to spy on a dangerous anarchist group and is tasked with bombing Greenwich Observatory so it can be blamed on the anarchists. As Chief Inspector Heat (Graham) becomes more aware of his suspicious activities, Verloc uses his vulnerable brother-in-law Stevie (Charlie Hamblett) to help him carry out his mission.