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's killing his customers.
Baretta has to go on the run to clear his name after he's framed for the murder of a gun dealer he was investigating, who was selling weapons to teenagers.
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.
When a conventioneer is murdered, Baretta finds that the only witness is a busboy who doesn't want to get involved, but the real murderer is after the man too.
To find an arsonist, Baretta seeks the help of a former investigator who retired after suffering both physical and psychological damage in a fire.
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's responsible for the death of her boyfriend.
Persuaded by the grandson of a retired cop who had supposedly been killed in a fall to reopen the case, Baretta discovers a judge on the take.
To infiltrate a gang of jewel robbers, Baretta seeks the help of a former expert safecracker he once sent to prison.
When a dying hoodlum entrusts his girlfriend with a detailed record of all his underworld activities, she is sought by both the police and his former cronies seeking to protect themselves.
Even though he has no evidence, Baretta suspects a man named Mazurski of killing a petty criminal. His hunch is based on the man's wife Doris being injured during a burglary committed by the now dead man.
Baretta aids a watchmaker who refuses to pay protection money to a mobster.
Baretta must find a nurse's nine year old sister, witness to the murder of a blind hot dog vendor, before the killers do.
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 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.
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.
After a young pickpocket named Jonesy is killed, Baretta solicits the help of an expert to infiltrate a gang that operates at an airline terminal... not realizing that the reason for the death is related to the lifting of a passport from a hired assassin.
Baretta risks his life going undercover as a prison inmate to discover why two suspects in a jewelry heist were killed.
Pursuing a gunrunner with spinal meningitis, Baretta becomes infected and has 48 hours to find the man and his cohorts before he has to go into quarantine.
A mentally challenged deli waitress who sees a narcotics cop commit murder allows herself to be persuaded that another man committed the crime.
When a mother has second thoughts after selling her baby, she helps Baretta infiltrate a group trafficking in black market babies.
