上海解放前夕，宝通纱厂暗藏特务张荣奉主子萧良之命，混入被捕的工人之中，伺机日后行动。解放后，张荣出狱返厂，继续伪装进步，潜藏在工人内部。平日里张荣用极左的言行粉饰自已，挑唆工人与资方的关系，并指使李福生潜入车间破坏设备。工会干部朱亚琴发现李福生行径可疑，主动找李福生谈话，并向他阐明政策，李幡然醒悟，主动向公安局坦白交代自己的罪行。政策的宽大并没有警醒顽固的张荣，他利用狱友黄子和的关系，将妹妹张杏华安插在江南钢铁厂，并通过黄子和搜取该厂机密情报，通过萧良送到台湾，最终酿成了钢铁厂被敌机轰炸......
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