October 1940. General Francisco Franco plans to go by train to Hendaye, where he will meet Adolf Hitler. Elsa Braumann is a young translator of German books who survives in 1940 Madrid in the care of her sister. One night, at the Madrid Captaincy, Elsa is required for a secret mission related to the meeting between Franco and Hitler. Over the next few days, Elsa begins to become intimate with Captain Bernal, the operation's security chief, a cultivated man and a movie lover, like her. But someone threatens Elsa to involve her in a counterintelligence operation: she will have three minutes to steal certain documents from Franco on the train that will take them to Hendaye. The fate of World War II is now in the fragile hands of Elsa Braumann, those who are about to betray the man with whom she is falling in love.