Austrian Captain Karl von Raden attends the opera one evening, and meets Tania.After the performance, he takes her home, and the two of them spend the next day on a romantic outing.

• 青年军官卡尔在歌剧院与美丽的塔妮娅一见钟情，卡尔奉命去柏林，在车站得知塔妮娅是军方正在追捕俄国间谍，他们的军事计划已泄露。