Napet triler govori o ženski, ki naleti na presenetljivo odkritje z nevarnimi posledicami. Dogajanje je postavljeno na idilično britansko podeželje v poletje 1939. Anne Keyes je privlačna mladenka in dokaj uspešna igralka, ki naleti na nevaren dokument o politiki glede nacizma. Ko o svojem odkritju pove bližnjim prijateljem, kmalu začnejo umirati v sumljivih okoliščinah, sama pa ne ve več, kaj naj stori s smrtonosnimi skrivnostmi.
1939 is set between present-day London and the idyllic British countryside in the time before the beginning of the Second World War. At a time of uncertainty and high tension, the story revolves around the formidable Keyes family, who are keen to uphold and preserve their very traditional way of life. The eldest sibling Anne is a budding young actress who is in love with Foreign Office official Lawrence, but her seemingly perfect life begins to dramatically unravel when she stumbles across secret recordings of the pro-appeasement movement. While trying to discover the origin of these recordings, dark secrets are revealed which lead to the death of a great friend. As war breaks out Anne discovers the truth and flees to London to try to confirm her suspicions, but she is caught and imprisoned and only then does she finally begin to discover how badly she has been betrayed.