In the present-day frame of 1992, elderly Linda Voss [Melanie Griffith] sits for a BBC documentary, recounting a life that wound its way through the perilous years of World War II. Born in New York City to a family of mixed Irish and German Jewish heritage, she carried a lifelong dream of Berlin and the chance to reconnect with scattered relatives. In 1940, Linda seeks a secretary position at a prestigious law firm but is hired for a more unusual role: a translator for Ed Leland [Michael Douglas], a stern, precise attorney whose behavior soon sparks Linda’s suspicions that he might be a spy. What begins as professional proximity develops into a dangerous romance as the pair become lovers, their bond tested by the pressures of a world at war.
After the United States enters the conflict with Pearl Harbor, Ed rises to the rank of a colonel in the OSS, and Linda follows him to Washington, D.C., only to be given the cold reality that he is posted elsewhere. She later learns that he returns with another officer, a striking woman who signals a drifting apart. Yet Ed quietly rehires Linda, drawing her back into the intelligence game. When a Berlin undercover operative is murdered, Ed and his team scramble to fill the gap, and Linda volunteers, her fluency in German and her evident determination convincing them to put her on the front line of a critical mission: to recover information about the V-1 flying bomb.
The journey takes Linda from Switzerland to Germany, where Ed entrusts her to Konrad Friedrichs, an elderly master spy who shields her in his house in Berlin and introduces her to his niece, Margrete von Eberstein [Joely Richardson], a socialite covertly aiding the Allied cause. Linda adopts the alias Lina Albrecht and is planted as a cook in the household of Horst Drescher [Ronald Nitschke], a social-climbing Nazi officer. The dinner at Drescher’s house spirals into chaos when Linda’s preparations fail, and she is summarily dismissed. Yet fate has a sharper turn in store: she later encounters Franze-Otto Dietrich [Liam Neeson], a war-hardened officer who hires her as a nanny for his two children, pulling her further into the danger-and-identity web she dares to navigate.
Linda combs Dietrich’s home for secrets about the V-1, hoping to photograph confidential papers, but finds nothing tangible at first. Meanwhile, Ed spots Linda in a newsreel featuring Hitler’s Berlin parade, and his agents identify Dietrich as the man seen beside her in the film. Determined to rescue her, Ed travels to Germany, disguising himself as a wounded high-ranking German officer who has lost his voice. He locates Linda and urges her to flee with him, yet Linda reveals she has discovered that her Jewish cousins have found themselves in hiding nearby, a discovery that complicates her return.
As the days unfold, Linda tirelessly tracks down her relatives’ shelter, only to discover they have just been captured. An Allied air raid drives Linda and the children to seek shelter, and in a tense moment the hidden basement of Dietrich’s house reveals its own secret: a hidden room and the blueprint for the V-1 rockets. Linda seizes the opportunity to photograph the blueprints, her cover nearly blown when Dietrich himself notices a threat to his carefully built life. Yet Dietrich, who has begun to fall for Linda, invites her to the opera, a gesture that backfires as Margrete’s mother [Sheila Allen] recognizes Linda’s face. Dietrich’s heartbreak deepens as he returns to his home and steadies himself, watching Linda as she feels the weight of danger closing in.
The plot thickens as Margrete—unmasked as a double agent—shoots Linda during a tense confrontation. Linda fights back and kills Margrete, slipping away through a laundry chute to escape the raid on Margrete’s apartment. Wounded but unbroken, Linda is found by Ed and Friedrichs and carried to a railway station for evacuation. They push toward the Swiss-German border, with Ed’s mute act failing to fool the border guards; a violent struggle ensues, and Ed must shoot his way through to ensure both their escape. Across the border, Ed bears Linda to safety, and though he is wounded again, the two persevere.
Back in the present, Linda reveals that the microfilm containing the critical German documents was hidden inside her glove all along, and that Allied bombings at last crippled the V-1 program. The couple recovers in a Swiss hospital, and the film closes on the quiet, stubborn truth of their partnership: Linda and Ed have remained married ever since, their bond forged in the crucible of danger, deception, and unwavering love.
