Adolf Verloc is a double agent, working for both the British police and a foreign country. He pretends to live a normal life, with his wife, Winnie, and has a shop in London, which, at night, becomes a meeting place for anarchists. One day Verloc is told to plant a bomb, but the plan goes terribly wrong. Does Verloc really love Winnie, or is she just part of his cover? Can Winnie ever forgive him? Who is Verloc really working for?