忠臣(chén )宋沅(🆓)被(⛲)奸相(xiàng )贾(🥇)守道陷害入狱(yù ),只(zhī )有携先(xiān )(🕟)皇(🕸)所赐的(🕰)「免死铁券」上京伸冤(🐉),方可(🍖)免(🔬)罪。贾守道派出锦(jǐn )衣卫高思贤(王侠饰(shì ))搜夺(duó )铁(🖲)券,以置(🔸)宋(sòng )沅于死地(🛍);宋妻及女宋(sòng )洁(✳)(李(🥄)菁饰(shì ))将「(🐖)免死铁券」藏(🥞)于琵琶中,沿途(🚸)卖唱掩饰。无赖吴三(魏平澳饰)得知(zhī )宋(sòng )氏母女真正身份(fèn ),心想利用(yòng )她们(🎛)换(🌊)贵(㊗)官高禄(💻),将高思贤引来,混乱中「免死铁(tiě )券」(💪)被做在砖(🈴)內,却无人知(zhī )晓……