Zhang Yiang, a police officer who has been out of the front-line criminal investigation for several years，Because of the anonymous report letter received by the provincial department，He was sent to Sanjiangkou to investigate the case。Soon after Zhang Yiang arrived at Sanjiangkou, he encountered the murder of the criminal police captain，Zhang Yiang accidentally arrested the murderer of the serial murder case when he cleared his own suspicions，Build prestige quickly。Zhang Yiang locked the direction of the investigation to the local wealthy businessman Zhou Rong's gang，But stupid thieves emerge one after another，The butterfly effect of intrigue between stupid thieves，Instead, it helped the police led by Zhang Yiang to make miraculous achievements。 “fate”Let Zhang Yiang gather with all the stupid thieves，Have the last laugh with wisdom and courage，The cause of the murder of his colleagues was also identified，In the end, the real culprit fell into the legal net。