Da Zeng retired, Jianghan went to the special forces, Tian Rui switched to fashion design, and Chang Baole died in the case of 8 15.

8 15 case is a main line running through the third part of six groups of major crimes. It mainly tells the story of Wang's criminal gang robbing a bank of 8 million yuan. In the final shooting, Baole died and Yang Zhen was injured in the waist, but the bullet was fired from Ji Jie's gun and could not be arrested.

Yang Zhen was transferred to the rule of law department after being injured, Ji Jie was transferred to the pre-trial department, Lao Zheng was promoted to deputy division marshal, left, and the old six groups were gone. The new six groups are led by Ding Jian. The 8 million finally fell into the hands of Herry Liu, one of the principal criminals. In order to get this 8 million, Wang's younger brother planned a robbery, and they launched a contest of wisdom and courage!

Six groups of serious cases, telling thrilling and confusing cases, show the true colors of the police and promote righteousness.

Members of the six groups of major crimes are Zeng Keqiang, Ji Jie, Jianghan, Bai Ling and Tao Huang. The first three have been engaged in solving crimes for many years, and the last two have just left the police academy. Under the direction of the director (Juck Zhang), they cracked a case of murder, explosion, poisoning, kidnapping, robbery and amputation. But under the brave and cold faces, the five people also have tenderness and anxiety.

Zeng Keqiang was killed for being late in a case investigation, and vowed to catch the murderer, but failed. On the eve of Ji Jie and her boyfriend stepping on the red carpet, she found him having an affair with his sister. Most of the investigation knowledge of Bai Ling and Tao Huang comes from books, and the lack of actual combat experience often drags them back ... And these five people often have contradictions because of their different temperaments. But when a case needs to be investigated, these five people can always adjust their status quickly and regard catching the murderer as the first priority.