A sleepy passenger on a late night bus witnesses a man in a second story apartment strangling a woman. When a police investigation finds nothing,the man hires Gunn to find the killer-before the killer finds him.
Gunn is called late at night by a man who tells him:"hurry, come to my house. There is going to be a murder-mine". As Gunn arrives there is a gunshot and he and the man's wife find her husband dead, an apparent suicide. However the wife is suspicious and hires Gunn to follow a suspect-all the way to Rio de Janiero.
A gourmand gangster blows up his rival and a gourmet restaurant at the same time. The restaurant's cordon bleu owner helps Edie open her own supper club ("Edie's") and in return Gunn teams up with him to bring the mobster to justice.
A dying millionaire hires Gunn to deliver a large donation to an oddball candidate for governor. The candidate can't hold onto the donations he already has-Gunn and Jacoby help him when his campaign manager is assassinated.
A prisoner brought to court for sentencing somehow has gotten a gun and kills the judge before being killed himself.Lt. Jacoby is assigned to investigate the case and his interested friend Peter Gunn helps by using his network of informants.
Fearing he will be next,a theft-gang boss tries to hire Gunn to find out who is killing off his men. Peter Gunn turns him down but is framed for the man's eventual murder. Lt. Jacoby and Gunn have one essential clue to the real killer-he has a punch like a sledgehammer.
A race horse owner hires Gunn to find out who murdered his longtime trainer. The main suspect, a race fixer, wants Gunn to prove he didn't do it. One of Gunn's contacts furnishes leads to an ex-circus strongman and a crippled jockey.
When an ex-racketeer is murdered,his brother asks Gunn to protect him before he's next.Peter Gunn arrives too late but before dying the man identifies a deported mobster as being the killer.Tipped as to where the mobster's old girlfriend is working,Gunn starts the manhunt.
A convicted man being escorted to prison via the train is freed by a confederate. The man's wife contacts Gunn to hire him to recapture her husband. Due to him believing she tipped the police and caused his arrest,she fears her husband will kill her.
A young singing sensation is in town performing at a local nightclub. The manager of the singer hires Gunn, a WWII buddy of his, to deal with a blackmailer who knows about the "youthful indiscretions" of his client. The coinciding attack on the club's Hatcheck Girl leads to the solution.
Gunn is asked by an old-time, fellow private eye to find out who killed his partner-before he is next. The murdered detective had been investigating a three-year-old,unsolved $500,000 bank truck heist. Lt. Jacoby suspects a polished hood but has no proof.
A young boy "pays" Gunn to protect his father from unknown men who beat him up. After Gunn starts to investigate,the boy denies needing help. The father is found but denies having a son. Questions surround the boy's "Aunt and Uncle."
An eccentric employee executes a plan to make his bank employer institute a pension plan. He steals the cash in the vault and won't return it until they agree. But a mobster reads of the story and decides to kidnap him and take his money.
After one of three bank robbers in a $200,000 heist is captured, Jacoby and the police are distracted by a visiting dignitary and the prisoner escapes. Gunn is asked to use his "friends" to find the prisoner, his associates and the money.
Ed Stone, a hard case whom Gunn helped send to prison, is paroled. Stone calls Gunn and lets the latter know he has little time to live. Ignoring Jacoby's suggestion to leave town, Gunn schemes to fight on his own turf.
A man hires Gunn to find his brother who mentioned in his most recent letter being in an obscure South American country. Jacoby is treated to a "vacation" by Gunn and goes along to look for the man. They find a lot more than a missing man.
A newspaper gossip column item leads to a noted author hiring Gunn to investigate his wife. But the author is murdered so Gunn seeks to find the killer and starts by investigating the wife. Turns out she has more than one man in her life.
Sgt. Davis is accused of fatally shooting an unarmed derelict. Lt. Jacoby asks Gunn to help investigate the case and clear Davis. Davis claims he has been framed, possibly by an important hood he recently helped convict of mugging and murder.
A wealthy girlfriend of Edie has a son who asks Gunn to background check his mother's new husband. The boy has uncanny ESP and "knows" his mother will be murdered. Gunn is skeptical until the new "father" has the boy put in an asylum.
The wife of an old friend asks Gunn to find her disappeared husband. The police seek him as he is a suspect in the murder of a witness against a top mobster. He used to work for the hood and Jacoby suspects there is still a connection.
A singer, who fifteen years before was found Not Guilty in the questionable shooting death of her gangster husband, hires Gunn to help with a blackmailer. Her psychiatrist was robbed of tapes made during analysis revealing the real story.
A swimming instructor stands idly by while a female pupil drowns. He hires Gunn to find out why this happened. He's about to be charged with Manslaughter by the D.A. Gunn is cynical but will investigate the seemingly open-and-shut case.
A boxer making a comeback escapes a murder attempt. Gunn becomes involved when a pickpocket friend has a clue to the plot. Gunn noses around and finds the boxers' ex-wife, manager, owner and others may have been involved in the incident.
A cab driver saves a woman from a beating and from being forced into a car by two thugs. Afterwards, she disappears while he goes for help. The cabby tells his friend Gunn about what happened and this leads into the search for a girl who is "trying to get lost". She is a witness against a top hood and is on his hit list.
A Mexican immigrant's son is accused of killing a drug dealer. Lt. Jacoby feels the young man had a motive and the opportunity to have committed the crime. Gunn, an old friend of the father,looks into the case. The family business plays a part in the truth of what happened.
A ballet dancer hires Gunn to find her old dancing partner who has recently broken out of a sanitarium. He holds a grudge against her and before being committed he had threatened her life. The girl's new beau, a gangster, vows he will kill the "sick boy" if he finds him before Gunn or the police do.
A racketeer is beaten to death and a woman hires Gunn to find out if her old flame, a Korean War hero,was responsible. Lt. Jacobi knows the man,who has been an out-patient for being manic-depressive for years. Meanwhile, a fellow mobster is worried he may be blamed for the kill and wants to force Gunn to clear his name.
The biggest Racket Man in town is out on bail and "blows up". Or did he? The hood's bondsman out $100,000 hires Gunn to find out. A derelict who disappeared with a $90,000 winning Irish Sweepstakes ticket may figure in the case.
An unhinged female admirer of Gunn kills to prove it. First is a hood who threatened Gunn. Next is his lowlife brother. Gunn must prove he's not the killer and find out who's next before the hood brothers' father takes revenge.
Gunn goes to Acapulco, Mexico to look for a woman spotted down there recently by his friend. The woman is supposed to be dead and her husband is currently in the news. He has used his last appeal and is soon to be executed for her murder.
As Gunn is leaving Mexico, he is offered a job guarding a fading movie star. Gunn successfully keeps that star from the bottle and on the set. When he is kidnapped Gunn has to find him. He finds that the brother-in-law was behind the plot.
About to leave Acapulco, Gunn surprises and shoots an intruder in his hotel room who gets away. Local police determine the man is a mob hit man who's after a witness against a U.S. mobster. Jacoby hears the name and rushes to Alcapulco.
Still in Acapulco, due in part to Jacoby's bad sunburn, Gunn is asked by local police to look into the near murder of a U.S. diplomat's son. The emotional problems of the boy, the victims of a car wreck and a debt to a gambler are leads.
Back from Mexico, one of Gunn's "associates" tips him to a "suicidal type" woman. Gunn saves her life and pursues the case. Saving her a second time, Gunn is shot. Then a punk hood tied to her goes missing and Jacoby investigates the lady.
Gil is due to marry a socialite but is blamed for a hit-and-run death and has no alibi. Gunn finds Gil's mechanic is linked to a gambler who holds IOU's from the socialite's brother who doesn't approve of his sister's upcoming marriage.
A dying white man from Haiti hires Gunn to find out why he, his wife and his farm are having trouble. Gunn travels to Haiti to find locals suspecting voodoo. Gunn digs for physical evidence but is stymied by uncooperative local police.
An insurance company hires Gunn to determine the ownership of $500,000 worth of jewels which may have been stolen. They were found in an apartment of a murdered man who's wife now has laid claim to them. A disappeared bookie figures in.
Gunn is hired by a reclusive billionaire to recover documents stolen by his girlfriend. After finding she has been strangled and then awakening from a conk on the head to find the billionaire's Assistant dead, Gunn calculates one plus one.
