善良老妇李桂花因一念之仁,救下即将产仔的金壳河蚌。金壳知恩图报,不仅赐珠救活其老伴(bàn ),更在(zài )其孤(gū )苦无(wú )依时(shí ),派儿(ér )子江(jiāng )生化(huà )作凡(fán )人陪(péi )伴左(zuǒ )右,为(wéi )她养(yǎng )老送(sòng )终。祖(zǔ )孙俩(liǎng )以善(shàn )行感(gǎn )化乡(xiāng )邻,齐心击退了贪图河神财富的恶霸。最终江生功成重返大江,一生向善的李桂花在村民敬重中安享晚年,高寿善终。