《三少爷的剑》是古龙最成功的作品之一，以神剑山庄三少爷谢晓峰和燕十三两位巅峰剑客之间的对决为中心，记叙了一场凄美的江湖情仇。原著中三少爷谢晓峰是号称“天下第一剑客”的绝世高手，少年得志的他很快厌倦江湖血腥，故事从他的神秘失踪开始拉开帷幕。
这部著作曾多次被改编成影视作品，其中最受欢迎的当属1977年大导演楚原拍摄的版本，当时饰演三少爷的正是尔冬升。燕十三剑法无双，却被误认为神剑山庄的三少爷。他身患绝症，只求与三少爷决斗，为自己正名。三少爷则厌倦杀戮，化名阿吉，流落妓院。其旧情人慕容秋荻因爱生恨，血洗神剑山庄，只为逼他出山。
“剑气纵横三万里，一剑光寒十九洲”，神剑山庄三少爷谢晓峰（林更新 饰）惊才绝艳，十年来历经上千大战未尝一败，被天下人尊为“剑神”。传奇剑客燕十三（何润东 饰）一直以谢晓峰为目标，苦修剑道，终于在生死边缘悟出惊天地泣鬼神的“绝命十三剑”。一时之间，江湖沸腾，然而，就在燕十三赶到神剑山庄下战书的时候，迎接他的，却是三少爷谢晓峰的灵柩。燕十三因痛失对手大感失望，此时神秘女子慕容秋荻（江一燕 饰）出现并告知燕十三，谢晓峰并没有死，要想找到他决战，燕十三就必须要替她杀一个人……
慕容正对女儿与仇家─谢晓峰私订终身，非常愤怒。宁可要她嫁于大师兄─纪钢，也不欲她嫁入谢家。在「听涛小筑」内纪纲去找燕皇赐给他的美女沉鱼(刘莉莉饰)，沉鱼表白忠于燕皇也忠于纪纲。燕十三终于发现秋荻心中所爱并非自己，痛苦间，慕容秋荻对燕十三苦苦哀求，让她出去见谢晓峰一面，燕十三终拗不过之而心软，私自将秋荻…
明朝太祖年间，神剑山庄由于为朝廷驱逐蒙古鞑子，助皇上登基有功，受到皇上赏赐「天下第一家」牌匾，因此引来另一武林世家不满，原来慕蓉世家亦也协助朝廷立功，不服神剑山庄坐上「天下第一家」位子，两大世家争持不下，终于发生冲突，幸好张三丰及时出面调解，才幸免酿成血战。最后达成协议，神剑山庄的谢玉孙(许鸿达饰)和…
秋荻在成亲前夕，三少爷谢晓峰竟然带着另一女子逃婚私奔，秋荻大受打击，柔肠寸断。谢玉孙痛斥次子-谢晓峰犯下的罪行，悲痛间广发武林帖，要天下英雄对谢晓峰诛杀毋论，最后谢玉孙更认为教子无方，罪孽深重，举剑自刎以谢天下。慕蓉正更认为自己是江湖上有头有脸之人，谢晓峰对秋荻始乱终弃，口口声声要和慕蓉家和好，但竟…
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