A thought of madness, a thought of hell. Three killers who do not know each other and go their own way - Liu Fan (Ai Wei), Cheng Yunxin (Chen Guobang) and Ge Shu (Zhan Ruiwen) thought they could hide their identities and escape legal punishment. Unexpectedly, they met a forensic doctor He Fei (Wang Yixing) who can see the last 30 seconds of the death of the deceased through a special device, a Taoist priest Zhou Chuji (Liu Weng) who is well versed in Maoshan magic, and a group of unremitting detectives including their boss Madam Kok (Elanne Kong), old detective Uncle Ma (Lou Nanguang), brother and sister Yu Yixin (Kelly Yeung) and Yu Yixin (Cen Ka-kei), etc. The group of killers unraveled the mystery and joined forces to cross the border to track down the real murderer. In order to prevent them from finding out the truth of the murder case, these three murderers with their own ulterior motives stood on the same front and killed again, setting off the bloodiest battle between good and evil.