Baretta fears his close friend, the owner of a music store, is not only a drug dealer but may be killing people with his pure heroine he is selling.
When a gun dealer who was selling his goods to kids is found dead, Baretta is framed for the murder and goes on the run.
Baretta must protect himself and a runaway girl as they enter a police car which he didn't realize was being driven by a couple of thieves.
A convention attendee is found dead and the only witness seems to be an uncooperative busboy who is afraid to become involved, but the murder is looking for him, also.
Baretta seeks assistance on an arson case by asking for help by a former investigator who was injured both mentally and physically in a fire.
A series of murders at the waterfront has Baretta on the case, but his cover may be blown when a waitress recognizes him as the cop who killed her boyfriend.
Baretta discovers a dirty judge while reopening a case of retired policeman who was killed in a mysterious fall.
Baretta asks for assistance in capturing a jewel thief by questioning a safe-cracking expert who he once sent to prison.
A girlfriend of a dying thief is wanted by both the cops and his former underworld acquaintances hoping to protect themselves from the detailed record she has been entrusted with which reveals all his jobs he had worked.
Baretta keeps his eye on a truck driver who he believes killed a man that injured his wife, hoping he will let his guilt slip.
While investigating the theft of diamonds from Mr. Nicholas, Baretta ends up lending his services to a store owner who is told to pay money for protection to the East Side Benevolent Society.
Blind Bennie the hot dog vendor has been murdered, and Baretta needs to find a hooker's 7-year old sister who was a witness before the killers find her.
Baretta's partner is charged with shooting a man in the back. He searches for the only witness, as does the real murderers.
Baretta joins up with a motorcycle gang to keep his informant safe after his plea deal falls through.
When a boy dies at the hands of his doctor, the boy's father gets his revenge. Baretta must find him as well as round up the pusher's who sold the boy drugs in the first place.
A crimelord's arrest causes an uprising between rival gangs, making Baretta jeopardize the life of an undercover policewoman in order to ease the gang wars.
A mobster takes Billy as a hostage in order to get Baretta to hand over the $500,000 in bonds which he believes Tony stole after stopping a robbery.
Baretta gets himself into a gang which operates at the airport terminal in order to find the killer of Jonesy, a young pickpocket. But Tony is unaware that the murderer was a hired assassin whom the kid was trying to rob.
Baretta risks his own life by going undercover as an inmate so he can find out why a pair of jewelry thieves were murdered.
While hunting for a gunrunner with spinal meningitis, Baretta becomes infected and has only 48 hours to catch the suspect and everyone he has had contact with before being put in quarantine.
A mentally challenged worker at a local deli witnesses a murder committed by a narcotics officer, finds herself brainwashed into believing another man is the killer.
A woman comes to Baretta for help after deciding she wants her baby back she gave away, and helps him get close to the black marketers who traffic babies.