在三十年代的旧上海滩中，有着代号“灵猫”的地下情报站员乔山在同为情报员的古方仁、古文雅的配合之下，利用日本人对龙门打算盘的心理，取得了龙浦生对他另眼相看，在龙门处有了立足之地，乔山受上级命令打入了军统，还利用徐显文和郑博群两人之间的矛盾，游走在国民党、龙门帮和日特机关中间，并成功的救治我方的重要人物，同时乔山也与叛徒斗智斗勇，之后并严厉的惩办了叛徒。最终，在自己妻子和与自己亦敌亦友的同志许东城的暗中帮助之下，乔山也是凭借自己顽强的意志，在国民党特务和日本伪军之间展开了一场场激烈的殊死搏斗，终于，历经生死磨难，突破了层层重围，为苏区运送急需的军火和药物，支援苏区反围剿斗争，保卫了党的安全，为全国人民的解放立下了汗马功劳

In the old Shanghai Bund in the 1930s, Qiao Shan, an underground intelligence officer with the code name "Lingmao", met Gu Fangren, who were also intelligence agents, With the cooperation of Gu Wenya, he took advantage of the Japanese's mentality towards Longmen's plan, and won Long Pusheng's respect for him, and gained a foothold in Longmen. The conflict between the two was between the Kuomintang, the Longmen Gang, and the Japanese special forces, and successfully rescued our important figures. At the same time, Qiao Shan also fought wits and courage with the traitors, and then severely punished the traitors. In the end, with the secret help of his wife and his comrade Xu Dongcheng who was also an enemy and friend, Qiao Shan also relied on his tenacious will to launch fierce and desperate struggles between the Kuomintang secret agents and the Japanese puppet army. Finally, after going through life and death, he broke through layers of siege, delivered urgently needed arms and medicines to the Soviet area, supported the anti-encirclement and suppression struggle in the Soviet area, safeguarded the party's security, and made great contributions to the liberation of the people of the whole country