在这部跟踪剧情/战争片中,故事发生在南斯拉夫被德国法西斯占领期间的贝尔格莱德。南斯拉夫地下党为祖国的独立和自由艰苦地斗争着。在一座别墅的地下室，有一座秘密的印刷所，敌人千方百计寻找并企图摧毁它。斯坦科打入敌人内部，并取得侦探长职位。地下工作者索蒂尔被捕后背叛了党。在与德寇、叛徒的激烈斗争中，斯坦科献出了宝贵的生命，最终保护了地下秘密印刷所的正常运作。
Jelena and doctor Mirkovic realize that their relationship is not just fulfilling the party's task of better maintenance of the illegal press. When Mirkovic joined partisans, one of the illegal fighters didn't endure interrogation of the police and reveals the press-room's location. Jelena manages to save herself and the press continues its work.
