电视剧讲述了抗战胜利前夕，军统特训班留级生许忠义被迫到即将开赴东北的中共部队卧底，期间被我军的言行仁义所感化，对共产党有了新的认识，决心向我党自首。经考察，党组织决定利用他在经济、战略方面的天赋，派潜回国民党沈阳军统站为我军提供急需的战略物资。
许忠义只身进入齐公子隐藏的地下工事，与齐公子短兵相接，徒手搏斗。许忠义很快处于劣势。随即二人举枪相向，形成对峙僵局。就在许忠义劝说齐公子面对现实，交出“渗透计划”之时，赵致突然到来，从身后开枪击中许忠义。赵致拉起齐公子转身逃离，倒地的许忠义艰难开枪，打死了赵致。危急关头，杨克成和顾雨菲带着一队战士赶…
许忠义等三人回归部队，便得到国军十万余人被我全歼，兵团司令廖耀湘被活捉，我军解放沈阳的战斗即将打响的消息。同时杨克成也得到齐公子即将离开沈阳的电报。许忠义得知这一消息决定不顾个人安危，重返沈阳拦截齐公子的“渗透计划”。
为了搞掉许忠义，齐公子疯了，他下令逮捕所有与许忠义有关商家，并搜捕所有店铺寻找证据。他将所有人带回刑室逼供。终于有人在酷刑之下透露了顾雨菲现在的潜藏地点。杨克成得知大批地下交通站被督察大队袭击，迅速赶来转移隐藏在戏园子里的顾雨菲。但杨克成慢了一步，齐公子已经包围了戏园。双方交火中，地下党老周舍身勇保…
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