周博士发现一种高度危险的细菌(X2菌),并邀得妻子的表弟耀明协助研究及提炼血清。期间,一连串怪事发生,耀明女儿竟中毒身亡,细菌更被人盗窃;最后,耀明发现自己巳陷入杀局之中……Japan has already occupied Korea and now China. Chin, a young woman understands that the Motherland demands all her children to be brave, and sacrifice their lives for the liberation. Disguised as a prostitute, she will board a train to help a Chinese guerrilla group defeat a Japanese army convoy.