A homicidal maniac who uses a brick-bat is on the loose. A large dragnet slowly gets him cornered. A mad killer is loose in the city. In every instance he leaves the murder weapon behind but there are no finger prints or clues to the killers identity. Detective Sergeant Joe Friday has been assigned to Homicide and it's his job to get the killer before he strikes again. A mad killer is loose in the city. In every instance he leaves the murder weapon behind but there are no finger prints or clues to the killers identity. Detective Sergeant Joe Friday has been assigned to Homicide and it's his job to get the killer before he strikes again.