Introduction: Ren Jiahua (Yam Tat-wah), a clever thief, got a tip from his girlfriend Ann (Guan Xiumei), who works in a security company, and successfully snatched the huge sum of money from the cash truck with a group of criminals by high-tech means. The police were very nervous about this matter, so they set up an ad hoc group to investigate. Li Tiejian (Li Xiuxian), the chief inspector of the major crimes unit, was at a loss at first, just working around the clock with detective Zhou Jian (Zhou Wenjian) and others. After on-the-spot clues and clues, Sir Li suspected that Ann had something to do with the case, but there was no evidence, so he had to keep Ann and her boyfriend Hua in hospital for 48 hours for questioning. However, their calm performance shocked Sir Lee. Finally, Li did not hesitate to force him to ask questions in various cruel ways, but unexpectedly, the thief and his wife had strong willpower and in turn accused Sir Li of infringement. Just when Sir Lee was about to fail, he unexpectedly found a witness.