1944年，罗马，被纳粹侵占下伤痕累累的大街。德军肆无忌惮的搜捕着保卫家园的游击队，意大利地下反抗组织领袖、工程师乔治·曼菲蒂（马塞罗·巴格利埃罗 Marcello Pagliero 饰）遭到德军追缉。危急中，曼菲蒂逃往朋友弗朗西斯科家中暂避，在弗朗西斯科的未婚妻碧娜（安娜·玛妮雅妮 Anna Magnani 饰）的帮助下，曼菲蒂见到了唐·彼得罗神父（阿尔多·伯立兹 Aldo Fabrizi 饰），并请神父将一笔巨款交给游击队。弗兰西斯科为了掩护曼菲蒂而被捕，碧娜也中弹身亡。然而绝处逢生的曼菲蒂被女友告密，曼菲蒂和神父被捕入狱。纳粹故意在神父面前严刑拷打曼菲蒂，两人最终在敌人的酷刑和枪弹下英勇牺牲。 　　本片根据塞吉欧·阿米迪的原著改编。The location: Nazi occupied Rome. As Rome is classified an open city, most Romans can wander the streets without fear of the city being bombed or them being killed in the process. But life for Romans is still difficult with the Nazi occupation as there is a curfew, basic foods are rationed, and the Nazis are still searching for those working for the resistance and will go to any length to quash those in the resistance and anyone providing them with assistance. War worn widowed mother Pina is about to get married to her next door neighbor Francesco. Despite their situation - Pina being pregnant, and Francesco being an atheist - Pina and Francesco will be wed by Catholic priest Don Pietro Pelligrini. The day before the wedding, Francesco's friend, Giorgio Manfredi, who Pina has never met, comes looking for Francesco as he, working for the resistance, needs a place to hide out. For his latest mission, Giorgio also requests the assistance of Don Pietro, who is more than willing as he sees such work as being in the name of God. Don Pietro's position also provides him with access to where others are not able. Giorgio's girlfriend, Marina, a cabaret performer, doesn't even know where Giorgio is in hiding. Both Pina and Marina take measures to improve their lives under this difficult situation, those actions in combination which have tragic consequences.