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Chan, an articulate senior detective nearing the end of his career, is taking care of the daughter of a witness killed by ruthless crime lord Po. Martial arts expert Ma is set to take over as head of the crime unit, replacing Chan who wants an early retirement.
A young woman has a tragic accident, slipping on a skateboard and falling off the roof of a tall building. Koo Chi Ming, an insurance investigator, is sent to determine whether the girl's death is an accident or a suicide and he recognizes the young woman from an earlier chance encounter.
