In 1940, Linda Voss (Griffith) is hired as a translator for stiff attorney Ed Leland (Douglas). They eventually become lovers, but she soon becomes suspicious of his strange behavior and mysterious whereabouts. Her suspicions that he is actually a spy are proven correct when Ed emerges as a colonel in the OSS. After the attack on Pearl Harbor, when America joins the war with the Allies, Ed and his colleagues find themselves needing to replace a murdered agent in Berlin on very short notice, and despite knowing little about intelligence work, Linda volunteers, with her mission being to bring back data on a flying bomb developed by the Germans, with the help of contact Margrete von Eberstein (Richardson), which Linda thinks will be able to do by looking into officer Franz-Otto Dietrich (Neeson).
This film features examples of:
- Artistic License – Military: A group of soldiers salute Ed indoors at a social gathering, which one is not supposed to do. Not to mention that they do the all-too-common mistake in films of saluting with their heads uncovered.
- Framing Device: The bulk of the film is told in flashback, as an aged Linda is interviewed by a BBC documentary team.
- Jumped at the Call: Linda is all too eager to jump into becoming an agent.
- Lethal Chef: Linda initially assumes the role of a cook in the household of a climbing Nazi officer, but the dinner she prepares turns out to be a disaster, and the Nazi officer angrily fires her. In her defense, she arrived too late to properly prepare the food.
- Made of Iron: Margrete shoots Linda twice in the chest, but Linda is able to survive and even kill her attacker. Likewise, Ed is shot twice by a German sniper while carrying an injured Linda, but he survives and manages to gets himself and Linda across the border before collapsing.
- The Mole: Margrete, Linda's contact, turns out to have been a double agent, who in fact was the one who betrayed the agent Linda replaced.
- Taught by Television: Linda knows (or thinks she knows) about spying from watching spy movies. While she does correctly guess that Ed is a secret agent, her record is quite hit-and-miss (with more misses than hits).