改编自同名小说，讲述了一个以人体实验的名义杀害无数人的连环杀人魔，和为了生病的女儿想要救他的律师及一定要法治他的检察官之间的故事。
该剧改编自清闲丫头所著同名小说。故事延续第一部的剧情，讲述三法司少年团联手“攘外”，将一个个看似毫无关联的案件抽丝剥茧、扎根串联，护百姓安宁，更守家国平安的故事。
李长顺（张国强饰）在鸭绿江边诞生长大，某日，他深爱的土地和赖以生存的村庄遭到了美军飞机的轰炸，往日宁静的村庄霎时间陷入一片火海，父老乡亲们的生命如同草介一般脆弱，转眼间就飞灰湮灭。目睹这一切的李长顺悲愤交加，他加入了志愿军，要上前线为国家效力，为乡亲们报仇。李长顺和战友们共同进退，尝尽了人间苦楚，亦携手经历了无数个命悬一线的危机关头，彼此之间结下了异常深厚的友谊，然而，无情的战争还是将他们接连从李长顺的身边夺走。心中怀揣着仇恨，李长顺永远都是第一个挺身而出拼杀在最前线上，他用他的汗水和鲜血，筑起了新中国璀璨的未来。
In the small village of St. Mary Mead, Colonel and Mrs. Bantry, owner of the local manor - Gossington Hall is shocked when one morning a young lady's body is found in the library. They call in the police who soon run up against a brick wall, only finding out that the body is that of a dancer in London who the Bantry's didn't even know. But how and why was her body left in the library? To find out the truth, the Bantry's call in the help of their good friend and detective - Miss Jane Marple.
