In 1886 London, Verloc, a shopkeeper in Soho, secretly serves as an operative for the Russian government, unbeknownst to his devoted wife, Winnie. Frustrated by Britain’s tolerance of radical anarchists, the Russians pressure Verloc to detonate a bomb, aiming to force the authorities to take action against these extremists. Trapped between the demands of the Russians and the scrutiny of the British police, Verloc unwillingly involves his own family in a devastating scheme of terror.