五十年代的东南沿海某地，海防工作组周洁（袁霞 饰）正带领民兵夜巡，前方传来枪声，他们赶到出事地点，发现受伤倒地的通讯员黄小钢（晓梦 饰）。鲁维智（王润身 饰）刚从师部回来，得知阵地图被敌抢走，即令民兵驾船追赶。特务颜昌文（李舜才 饰）剌伤二春（王兴鑑 饰）跳海逃逸。很明显，我军驻地有敌特组织。此时在医院养伤的二春已被杀害，谁干的呢？这时林美芳（江芳 饰）进入了被怀疑的视线，她用美色引诱携带重要图纸的李坚（王昶 饰），鲁维智故意用假图纸暴露给林美芳，并趁机冒充爆破专家打入敌人内部。面对敌特头目陈封斋（杨角 饰）对自己设置的种种考验，鲁维智从容不迫，以革命者的大智大勇取得了敌人的信任......
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