The Yarra Central police are faced with an outbreak of well-planned thefts with no recovery of the stolen goods. Third-rate thieves commit skilful offences under the instructions of a master-mind of unknown identity, referred to as 'Mr. Fifty Percent'.

A confidence trickster tells the Yarra Central police that a young English migrant is planning a bank robbery. The plight of an elderly lady complicates the situation.

Mrs. Maguire is a successful business woman and charity worker. However, a street accident leads to a complex investigation into the truth about Mrs. Maguire and her daughter.

Alf Clark and his pregnant wife Jill are in partnership with her idealistic brother in a counterfeiting racket. Problems occur when they become involved with petty criminal Ted Jamieson.

Investigations into a series of safe breakings uncover an unexpected romantic but illegal entanglement when police discover a man with two wives.

Yarra Central police face a crime following a 20-year-old pattern. Investigations lead them to master criminal 'Chalky' Gunnerson, who is a clever chess player and plans his moves against the police with care and precision. Also involved are his daughter Vivienne and a rather brash young apprentice, Ricky Bevan.

John Anderson, a neurotic young camera enthusiast, unwittingly becomes a key figure in a police search for a couple of jewel thieves.

A husband and wife’s drunken brawl, Banner's search for a man who mutilated a prostitute, and a young boy who wanders into Yarra Central make this Wednesday anything but the usual quiet night.

Yarra Central police have to deal with a mysterious shop breaker and a lonely widower. Det. Peters' police duties are affected by events in his private life when his marriage is on the rocks.

Will 'Duff-Duff' Duffy, a clown who specialises in trick falls, and Hugo Smith, a criminal with a child-like personality, have never met, but their stories become intertwined when Yarra Central police investigate a robbery, a suicide and extortion.

An investigation into homosexual activity in Yarra Central leads to the discovery of a number of unusual burglaries.

A young country girl tries to set herself up as a prostitute in the city. She falls prey to a vice operator who sets up 'witchcraft' sessions for his clients.

Police at Yarra Central become involved in a robbery and an illicit stills racket, and all their investigations take them to the notorious O'Connell family.

While dealing with a teenage shoplifter, Policewoman Stewart experiences a frightening ordeal when they are held by a dangerous escapee from a mental institution.

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

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.

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 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.

Blind barrister Jessica Reynolds is persecuted by an unknown intruder.

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

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.

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.

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

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