In 1995, a large armed robbery occurred in Guangdong. A bank cash truck was robbed by five armed robbers, causing a loss of $15 million and three bank`s escorts were killed. The incident shocked the whole country. the Police immediately set up a task force, led by Wang Shouyue and He Lan to track the whereabouts of the five robbers, except the real mastermind behind the case - Chen Xinwen and his cousin Chen Xinnian. The men successfully escaped. 21 years later, the case has long faded from the public, and Wang Shouyue has retired. However, a video with a blurred figure rekindled his hope of solving the case. He went to the border city to look for the "stranger" in the video. The final showdown between good and evil begins after 21 years.