The year is 2003 and the linguist Katharine Gun works for GCHQ, a British information retrieval agency. During a working day, she discovers something that suggests that the american NSA, together with British agents, is trying to find information to pressure several countries within the UN to sanction a war against Iraq. She is appalled and decides to leak the information to a journalist who publishes the news. Soon she is in the middle of the action during an international conflict. She is arrested for violating confidentiality regulations while the UN Security Council condemns the United States, which decides to invade Iraq without consent. Official Secrets are based on the true story of the run-up to the US-criticized war with Iraq, and the moral dilemma faced by an individual citizen when she has to choose between doing what she thinks is right even if it goes against the law.