What is a human life worth? How is it possible that a woman like Agnes could agree to kill another human being? Is it the money? Or are there other forces at play?

London, 1886. Unbeknown to his loyal wife Winnie, Soho shopkeeper Verloc works as a secret agent for the Russian government. Angry that Britain harbours violent anarchists, the Russians coerce Verloc into planting a bomb that will provoke the authorities into cracking down on these extremists. Caught between the Russians and the British police, Verloc reluctantly draws his own family into a tragic terror plot.