A woman's anti-pollution campaign against a manufacturing company helps to uncover theft and corruption within the firm.

Yarra Central police investigate a feud between rival tow-truck services which threatens to erupt into violence.

A tough stand-over group runs a prostitution racket utilising drugs and abduction. Policewoman Margaret Stewart finds herself in difficulties while undercover posing as a prostitute to crush the racket.

Lisa Clark, a doctor's wife, becomes an addict after her husband introduces her to drugs. Investigating a house breaking, police find that a youth, like too many of his age, has become trapped on a road of no return through drug usage.

A young constable is savagely attacked and seriously injured by five youths. The Yarra Central police put on a 'command performance' act to extract the truth from the suspects.

Investigations into the theft of valuable but difficult to unload electronic equipment result in Yarra Central detectives investigating a highly organised betting syndicate.

Con-man Jimmy Harrison and his girlfriend turn to burglary, which spells disaster for his two young accomplices and an elderly fence.

When the driver of an interstate gang is arrested, Yarra Central police see their chance to smash the racket by having Det. Peters acting undercover as his replacement.

Two men of short stature - one a notorious criminal who exploits his build to his own advantage, the other a young misfit who resents his size - cause trouble for the Yarra Central police.

Det. Sgt. Vickers believes that Sen. Det. Banner's personal feelings may have impaired his judgement when Banner makes an all out effort to nail Eddie Parrish, a former policeman who has used his police know-how to muscle in on various rackets.

When radio talk-back announcer John Drew draws attention to a gang of car thieves operating in Yarra Central, his wife is threatened.

While police investigate a series of armed robberies, a young accountant tries to help his wife by giving police wrong information and is eventually blackmailed.

Yarra Central detectives investigate a brutal assault after John Kelso, a convicted murderer serving a life sentence, is paroled after 25 years.

Blind barrister Jessica Reynolds is persecuted by an unknown intruder.

An escaped convict goes into hiding in Yarra Central, holding a young girl as hostage.

The search for the missing son of an important local man reveals a strange psychotic personality.

Yarra Central police face a difficult task when the victim of a vicious assault is reluctant to give information against a gang of predators.

A bomb explodes in Yarra Central. Suspicion narrows down to a maniac who has escaped from jail, a thief, and a layabout protester. All have reason to seek revenge against the police, especially Det. Banner.

A young university student reports to police that she has been raped. A young man is charged, then additional information and the probing by the man's defence counsel creates doubts as to the truth of her story. Policewoman Margaret Stewart finds a romantic interest in the police doctor, Robert Whitfield.

An overworked detective, Barry Maguire, is transferred to Yarra Central on temporary duty and tries too hard to convict a criminal, with disastrous results.

A young man's bucks party is raided when the best man introduces a pornographic film to the festivities. When Yarra Central police investigate they uncover a world of vice and blackmail.

Leo Morrison escapes from prison to prevent his girlfriend marrying someone else, but his plans undergo a change when he picks up a girl hitch-hiker with decidedly unusual views.

Police investigate an attempted murder complaint and discover that a middle-aged veterinary surgeon has bigamously married several women.

A shop break-in interrupted by Const. Dwyer leads to a serious family altercation involving the police.

As Yarra Central police tighten the net around a man wanted for savagely attacking several women, Policewomen Diane Webster and Margaret Stewart volunteer to act as 'live bait' to trap the man.

A writer of threatening letters, a stand over merchant and the widow of an old wartime mate cause problems for Det. Sgt. Vickers.

Charlie Clarke turns to safe blowing to raise money after having his marriage proposal refused by his lady friend. Matters become complicated when some explosives go missing.

Attacks on women in a Yarra Central street upset neighbourhood relations, and the prime suspect is a man recently released from psychiatric care. Kevin Dwyer receives his long-awaited promotion to Senior Constable.

A family of criminals discover that Arthur Mitchell mints his own coins to supplement his pension. To muscle in on the racket, they kidnap his wife to force his co-operation.

Two amiable swindlers cause Yarra Central police chaos with a series of clever con tricks.

Det. Peters is having some personal problems due to his impending divorce, and the Yarra Central police have to investigate an allegation that he is being bribed.

Det. Peters, concerned about his divorce, decides to resign from the force. He then meets up with Denis Marshall, an alcoholic whose own marriage is threatened. Peters tries to help Denis, and discovers his own domestic situation is not as bad as he thought.

Carol Hayes is prepared to break the law in order to keep 7-year-old Ronnie whom she has been caring for. The child belongs to the Turners, and Jean Turner wants him back because her husband Mike is being released from jail.

A series of expert safe breakings leads the Yarra Central detectives into an industrial espionage plot.

Sgt. Scotty Macleod is looking forward to Christmas until he encounters a drunk-driving accident for which he feels partly to blame.