Portland, Oregon police detectives investigate a series of vicious armed robberies that are perpetrated by a pair of gunmen wearing Halloween masks who hold up small shop owners just before closing time and viciously pistol-whip their victims after rifling the cash register. The police develop a lead that points to denizens of church mission in a rundown portion of town.
The Salt Lake City, Utah, police department are attempting to break up a chain of illegal gambling establishments run by the Syndicate. Although the police manage to knock off most of the dens, they still haven't identified the leader of the gambling ring. Similarly, the crooks haven't found the undercover cop who's supplying the information to the Vice Squad. The cops and crook engage in a deadly game of cat-and-mouse to see who can identify the others' key personnel first.
Police detectives in Washington D.C. investigate the murder of a pair of security guards working in a downtown department store. Although they quickly identify a suspect, finding him in a large city with plenty of places to hide proves much more difficult.
An arson investigator looking into a series of supposedly accidental fires uncovers evidence that points to a convicted pyromaniac as the culprit--but he's confined to a hospital for the criminally insane.
The Chicago police investigate a series of armed robberies perpetrated upon couples parked in lovers lanes with the same modus operandi - the thief steals the boy's wallet and then pistol whips his girlfriend. Since the victims agree that the thug was dressed as a hobo, a vaudevillian turned police officer agrees to go undercover and to see if the thief can be found one of the area's hobo jungles.