忠臣(chén )宋沅被奸相(xiàng )贾守道陷害入狱，只(zhī )有(yǒu )携(🌰)先皇(🕋)所赐的(🕸)「免死铁券(quàn )」上(shàng )京(jīng )伸冤，方可(🐉)免罪。贾守道派(🐮)出(🥩)锦(💤)衣卫(wèi )高思贤（王侠(xiá )(🎏)饰）搜夺(duó )铁券(😎)，以置(zhì )宋(🐿)沅(yuán )于(🔸)死地；宋(🗄)妻及女宋洁(jié )（李菁(jīng )饰）将「免(🏐)死铁(tiě )(🐖)券」藏于(yú )琵琶中，沿(🍮)途卖(mài )唱(😻)掩(yǎn )饰。无赖吴三（魏平澳饰）得知宋氏母女真正(🌚)身份，心想(xiǎng )利用她们换贵官高禄，将高思贤(🙂)引来，混乱中(🙌)「免死(sǐ )铁(🙄)券」被(🙀)做在(zài )砖(⛓)內，却无人知晓…(👃)…