Official Secrets is a 2019 British drama film directed by Gavin Hood, based on the case of whistleblower Katharine Gun, who exposed an illegal spying operation by American and British intelligence services to gauge sentiment of and potentially blackmail United Nations diplomats tasked to vote on a resolution regarding the 2003 invasion of Iraq.

[3][4] Keira Knightley stars as Gun, alongside Matt Smith, Matthew Goode, Adam Bakri, Indira Varma and Ralph Fiennes.

Despite the Observer's pro-war stance, Peter convinces the chief editor Roger Alton that the leaked memo is worth publishing.

The Drudge Report attempts to discredit the document as a fake, as staffer Nicole Mowbray had inadvertently changed the text from American to British English with a spellchecker.

Following the outbreak of the Iraq War, Katharine seeks the services of the Liberty lawyers Ben Emmerson and Shami Chakrabarti.

The defence strategy is that Katharine was acting out of loyalty to her country by seeking to prevent the UK from being led into an unlawful war.

Ben suggests to the court that this is because prosecuting her would have shown that the Blair government led the UK into war on false pretences.

[6] Still, nothing came of it until January 2016, when a filming start in May was announced, with Harrison Ford, Anthony Hopkins, Paul Bettany, Natalie Dormer and Martin Freeman cast.

The website's critics consensus reads, "Official Secrets has a familiar structure and an obvious if worthy message, but rises on the strength of Keira Knightley's powerful performance.