《九河龙蛇》讲述在民国年间一座叫做九河城的城市发生的各种故事，电影中的钱不二被人们叫做神偷，意外获得了警探的身份，为了救自己的师弟张立三，张立三在江湖上被人们称为侠盗，从未做过偷鸡摸狗之事，却因为被人陷害而锒铛入狱，钱不二一心救出师弟，未曾想在自己走马上任，成为警探之初，便遇到了一桩悬案，要调查的人纷纷石化，人们纷纷传言这是因为包工头拆了火神庙，因此受到诅咒。

钱不二亲眼见到在众目睽睽之下，包工头成为了石像，相信科学的他不断努力发掘真相，试图找出事情背后的阴谋，于是先想办法救出自己的师弟，然偶与小神婆等人联手，希望能够找到这些人变成石像的原因，在百般调查之下，却发现了魔古道一桩筹划已久的惊天阴谋。

"Nine Rivers Dragon Snake" tells various stories that happened in a city called Nine Rivers City during the Republic of China. Known as the thief, he accidentally obtained the identity of a police detective. In order to save his younger brother Zhang Lisan, Zhang Lisan was known as a grand thief in the world. Dedicated to rescuing the younger brother, he never thought of taking office. When he first became a police detective, he encountered an unsolved case, and the people who wanted to investigate were petrified. People rumored that it was because the contractor demolished the Temple of Fire, so he was cursed

Qian Buer saw with his own eyes that the contractor had become a stone statue under the watchful eyes of the public. He believed in science and kept working hard to discover the truth, trying to Find out the conspiracy behind the incident, so he first tried to rescue his junior brother, and then joined hands with the little witch and others, hoping to find out the reason why these people turned into stone statues. After various investigations, they discovered a plan by Mogu Dao The long-awaited conspiracy.