While on vacation, a woman's husband is taken by the Russian government. After one attempt fails, she begins looking for a suitable spy to capture and trade in exchange for her husband, but she develops an attraction to the one she thinks is a good candidate.
In 1908 London, a women's rights campaigner discovers the Assassination Bureau Limited, an organization that kills for justice. When its motives are called into question, she commissions the assassination of its chairman. Knowing that his colleagues have recently become more motivated by greed than morality, he turns the situation into a challenge for his board members: kill him or be killed.