On temporary duty with the vice squad, Baretta learns that his partner is taking bribes, and is ordered by his boss to investigate the other officers on the squad as well.

Baretta must use his wits to survive after he and a runaway girl he apprehended unwittingly get into a police car being driven by a couple of holdup men disguised as cops.

Baretta doggedly follows a truck driver he suspects of killing the cat burglar who injured his wife, waiting for the man to make a mistake that will reveal his guilt.

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Baretta comes to suspect that his close friend, a music store owner, may not only be a drug dealer, but may be unknowingly selling heroin so pure that it is killing his customers.

When his partner is charged with shooting a suspect in the back, Baretta tries to locate the only witness who can save the man's career, but the real murderers are after him too.

When a mother has second thoughts after selling her baby, she helps Baretta infiltrate a group trafficking in black market babies.

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After a crime lord is arrested, Baretta must jeopardize an undercover policewoman to stop an escalating war of succession between gangland factions.

Believing that Baretta pocketed $500,000 in stolen bonds after stopping a robbery, a mobster takes Billy hostage until the money is turned over.

Baretta risks his life going undercover as a prison inmate to discover why two suspects in a jewelry heist were killed.

Baretta finds out that that hit man he is trying to stop from killing a local mobster may be one of his childhood friends.

Baretta has to go on the run to clear his name after he is framed for the murder of a gun dealer he was investigating, who was selling weapons to teenagers.

To infiltrate a gang of jewel robbers, Baretta seeks the help of a former expert safecracker he once sent to prison.

When a plea bargain falls through, Baretta must infiltrate a murderous motorcycle gang to save his informant.

Baretta tracks a distraught father who has killed the doctor he believes responsible for the death of his son, then has gone after the local drug dealers as well.

Baretta comes to the aid of a has-been comic trying to make a comeback, who has recently suffered several attempts on his life.

Baretta vows revenge on the hoodlum whose thugs murdered his girlfriend.

When his childhood friend is murdered, Baretta tries to protect the pregnant widow and her unborn child from the killers, and from her own drug habit.

While Baretta is investigating a series of waterfront killings, his cover becomes in danger of being blown by a waitress who knows him and thinks he is responsible for the death of her boyfriend.

A retarded waitress who sees a narcotics cop commit murder allows herself to be persuaded that another man committed the crime.

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Insufficient evidence allows a man to be released from jail and resume his efforts to hurt a nightclub dancer.

After an undercover policewoman is killed, Baretta poses as a fugitive gangster in order to infiltrate a mansion that the syndicate runs as a house of illicit pleasures.

To find an arsonist, Baretta seeks the help of a former investigator who retired after suffering both physical and psychological damage in a fire.