一场百(bǎi )年(🌠)罕见的蝗灾(zāi )侵袭了武周大地，武则天下令送赈灾银往灾(zāi )区，却在途中(zhōng )被劫(jié )，数万两(liǎng )白银竟(🐮)化(🥩)蝶(dié )消失！狄(dí )仁(rén )杰(⏬)命(🎲)其亲随赵员镇奉命彻(chè )查(chá )此案，自己微(🤷)服潜入民(🕖)间调查。在(zài )(✳)查案(àn )的过(guò )程(🏐)中他(🐖)们(🕌)遇(yù )(🛺)到(dào )了需自(🥞)证清(qīng )白(bái )的嫌疑(yí )(😻)人(🚸)官小柒，又陷入了赈灾银再次被劫(📎)的困窘(🔩)之境。灾民民(⏯)怨(yuàn )四起，化(huà )蝶案扑朔迷(㊗)离，朝堂(🗞)权谋(móu )暗潮(✋)汹(xiōng )涌，狄仁杰(🌞)是否能查清真(zhēn )相，天下又是否能重回太(🔔)平？