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 Police immediately set up a task force, led by Wang Shouyue and He Lan, and quickly found the whereabouts of the five robbers -except the real mastermind behind the case: the owner of a construction company, Chen Xinwen and his cousin Chen Xinnian. Chen Xinwen and Chen Xinnian took to the road and vanished. Twenty-one years later, the case has long faded from the public eye, and Wang Shouyue has retired. However, a video with a blurred figure rekindles his hope of solving the case. He goes to the border city to look for the "stranger" in the video. The final showdown between good and evil begins after twenty-one years.