『四級片』介(jie)紹:官(guan)員鄭巖離奇死亡,陸(lu)(lu)(lu)尋(xun)發現(xian)舞女封(feng)(feng)如月(yue)(yue)與(yu)其兄封(feng)(feng)空(kong)(kong)(kong)(kong)(kong)空(kong)(kong)(kong)(kong)(kong)可疑,而(er)封(feng)(feng)空(kong)(kong)(kong)(kong)(kong)空(kong)(kong)(kong)(kong)(kong)意外失蹤。根據線索(suo)陸(lu)(lu)(lu)尋(xun)和(he)大山、如月(yue)(yue)來(lai)到黑(hei)澤(ze)城。幾(ji)人(ren)意外救(jiu)下小(xiao)糖,不料小(xiao)糖反將幾(ji)人(ren)劫持。得知封(feng)(feng)空(kong)(kong)(kong)(kong)(kong)空(kong)(kong)(kong)(kong)(kong)也是(shi)被(bei)小(xiao)糖所(suo)抓,目(mu)的(de)就是(shi)要(yao)炸毀京城。為阻止小(xiao)糖,幾(ji)人(ren)逃離黑(hei)澤(ze)城。 陸(lu)(lu)(lu)尋(xun)戳穿了如月(yue)(yue)與(yu)封(feng)(feng)空(kong)(kong)(kong)(kong)(kong)空(kong)(kong)(kong)(kong)(kong)殺害鄭巖的(de)陰謀。如月(yue)(yue)坦白自(zi)己(ji)的(de)親(qin)(qin)生父親(qin)(qin)遭(zao)鄭巖陷害而(er)死,陸(lu)(lu)(lu)尋(xun)詫異(yi)二人(ren)與(yu)自(zi)己(ji)經歷(li)相同(tong),并表示(shi)父親(qin)(qin)留下一封(feng)(feng)密函。兩人(ren)取(qu)密函之(zhi)時遇到小(xiao)糖的(de)手(shou)(shou)下鬼(gui)手(shou)(shou),鬼(gui)手(shou)(shou)正是(shi)如月(yue)(yue)的(de)父親(qin)(qin)。在(zai)鬼(gui)手(shou)(shou)的(de)帶領下幾(ji)人(ren)通過機關來(lai)到地(di)下寶(bao)庫(ku),找(zhao)到了小(xiao)糖和(he)被(bei)綁架(jia)的(de)封(feng)(feng)空(kong)(kong)(kong)(kong)(kong)空(kong)(kong)(kong)(kong)(kong)。此(ci)時夜(ye)叉出(chu)現(xian),原來(lai)夜(ye)叉正是(shi)陸(lu)(lu)(lu)尋(xun)義父云錚(zheng)。當(dang)年云錚(zheng)為奪取(qu)寶(bao)庫(ku),欺騙小(xiao)糖。小(xiao)糖引爆(bao)了地(di)下寶(bao)庫(ku),陸(lu)(lu)(lu)尋(xun)等人(ren)逃出(chu)后與(yu)鬼(gui)手(shou)(shou)聯手(shou)(shou)將云錚(zheng)制服。