In 1914 Vienna, the story unfolds amidst the tense backdrop of World War I, focusing on a young woman named Elsa Elsbergen. She initially volunteers for nursing efforts, hoping to contribute to her country’s cause, but her secretive past and sordid history are soon uncovered, leading to her rejection from the nursing service. Despite this setback, Captain Muller believes that Elsa’s patriotism and background make her suitable for a more clandestine role within the Austrian Department of Intelligence.
However, Elsa is uneasy with the manipulation and the espionage activities she is being pushed into. Nevertheless, she accepts the assignment, driven by her sense of duty. Her first task involves a social event where she catches the eye of Captain Otto von Lichstein, a known spy for the enemy. Despite her initial disappointment at being used for espionage, Elsa agrees to meet him again, and their relationship begins to develop.
On her way home from one of their meetings, Elsa is nearly hit by a horse-drawn cab. The passenger inside, Sub-Leutnant Count Karl Runyi, a member of the Royal Navy portrayed by William Bakewell, is quick to apologize and insists on escorting her safely to her residence. A strong attraction develops between Elsa and Karl, and they start seeing each other every night, despite the disapproval from her superiors.
Meanwhile, Major Schmidt, played by H.B. Warner, reprimands Elsa for her involvement with Karl, advising her to focus on her espionage duties, but Elsa is steadfast and refuses to abandon Karl, even as she remains involved with von Lichstein. Karl, initially assigned to a less exciting position on an admiral’s staff, is presented with a rare opportunity to participate in a dangerous submarine mission. Though hesitant at first because of Elsa, she persuades him to seize the chance for glory, convincing him that failure would mean losing her love. She even lies in a heartfelt letter, telling Karl she has found someone else, adding layers of sacrifice and emotional complexity to their relationship.
Elsa’s ties to von Lichstein deepen, and she becomes his romantic partner. During an encounter where von Lichstein interacts with a drunken naval officer named Heinrich, a revealing conversation about their secret submarine route occurs. Von Lichstein decides that the intelligence about their secret maneuver would be the perfect end to his espionage career. Elsa, secretly fearing the worst, calls Major Schmidt and confronts von Lichstein, holding him at gunpoint. The situation escalates when von Lichstein splashes his drink in her face, leading to a struggle that results in the gun firing and Elsa being seriously wounded.
Von Lichstein, realizing the gravity of his actions, chooses to end his life by suicide. The chaos is interrupted by Schmidt and his team arriving on the scene. Meanwhile, Karl safely returns from his mission, receiving praise and recognition as a hero. Despite the danger and espionage, Karl visits Elsa, revealing that there was no other man involved in her past. They reconcile and become engaged, despite the concern from Countess Runyi, Karl’s mother, who uncovers Elsa’s troubled history and threatens to tell Karl about it.
In a touching moment of vulnerability and love, Elsa’s loyal maid, Katie, reveals Elsa’s heroism and sacrifice to the Countess. Moved, the Countess is still firm in her judgment but is faced with the heartbreaking news that Elsa only has six months to live because of her wound. Despite everything, Elsa marries Karl in a poignant and emotional wedding, embracing her limited time but full of love and hope for the brief moments they have together.
Throughout the film, themes of sacrifice, love, espionage, and personal redemption are woven together, painting a compelling picture of a woman torn between her past and her present, her duty and her heart. The story showcases a richly layered narrative of espionage during wartime, personal secrets, and the enduring power of love against all odds.
