江湖八大门派为争夺武林圣火令，逼死尹青松夫妇，留下一对年幼子女，分别由娥媚派及幽冥鬼叟抚养成人，双方约定十八年后，决一生死。此后八大门派互相厮杀，为争藏有武林圣火令的血图。谁料血图是假的，原来圣火令本是一对，阳面的圣火令收藏图，尹青松早藏于儿子天仇的襁袍中。天仇得幽冥鬼叟教以绝学，长成后，便依布图所示，到云梦山待月涧的山洞中寻回圣火令，为报父母之仇。途中遇上意中人杜娟儿，挚友段云秀以及娥媚派的倪丹凤。天仇初遇丹凤便如见亲人，丹凤亦有同感。四人巧遇，被竹山派偷袭，天仇以圣火令击退他们，娟儿不慎遭毒蛇咬伤，生死未卜。

A loving couple are killed after drawing a map of the coveted Moslem Sacred Fire Decrees with their blood under coercion. The map is split into eight parts, placed separately in the custody of the eight leading martial sects. The children of the couple are adopted by Elderly Spirit from Hades and Nun Silence of Emei respectively. Growing up, the son Wan Tin-sau inherits from Hades all the skills he will need to know to take on the nun and her protegee in a duel 18 years later...