One Day, a medium built stammerer, Jun (Wang Bao Qiang) confesses five murders at police station, but he fails to illustrate the details, after long oral examination the police believes Jun is mentally disorder and his mentioned murder cases do not come from the fact. Soon after, a cold-blooded murder unveils a series of mysterious murders in the district where Detective Han (Lau Ching Wan) stations in. Each of the victims is executed by different but equally brutal way. Han knows that he is dealing with a serial killer. Instinct tells him Jun is the suspense after he goes over all recent statements. His team goes and rummages around in Jun’s apartment and finds a pile of old fairy tale books. With this hint, Han immediately sets off to examine the fairy tale books and discovers mysterious symbols on the books, evidences show that three more vicious murders will happen, time is running out, Han is desperate to save the poor sufferers…