Diana Langston is the main suspect in the murder of her husband Ken. Nevertheless, she protests her innocence and asks detective Frank Cannon for help. He comes along immediately on the way to New Mexico to find the real murderer of his old friend. Although Frank Cannon has to fight with the hostility in New Mexico, he doesn't surrender. He wants to prove Diana Langston's innocence. Policeman Calhoun comes to lend some assistance to the tubby detective.
Frank Cannon is called in to investigate a robbery and murder of six people at a rodeo. The police had come up with nothing after six weeks except for the knowledge that there was a film taken of the rodeo at the day of the crime. Cannon believes that there is a possibility that the rodeo clowns may have played a part in the crime and must now learn where the clown suit came from.
The death of a bank manager's mistress leads Cannon into a case of murder and betrayal.
Cannon goes undercover as a truck driver to investigate a series of hijackings.
Cannon is hired to investigate when a famous singer is killed in a plane crash. But for some reason, his family is not cooperating and wants the case closed quickly.
Young Charles Lassiter has been kidnapped and the crime seems to be an inside job. But when Charles escapes, he must be silenced before he can reveal who the kidnapper was.
The townspeople of the deserted city of Julien, create a conspiracy by using stolen money as a means to make their area look like a boomtown again.
A search for a missing girl leads Frank into a case of murder and a romantic triangle when Cannon is hired by the child's mother.
A murderer has blamed his crime on a innocent cop and Cannon is out to prove who the real killer is.
A syndicate boss may just be next in line to be murdered when Cannon investigates a case involving a triple homicide.
When an heir of a millionaire who prefers to live like a hermit is discovered to be missing, Cannon in hired to investigate and uncovers a mysterious case of murder and embezzlement. But the case is hampered by the hermit's attorney.
The reopening of the cold case of a salesgirl reveals that a bicycle she sold may be a clue to her death.
Cannon is hired to be a bodyguard for the daughter of a broker and his grandchildren, but is drawn in when the broker reveals that he believes his son in law is involved in a murder.
An accountant wants to teach the world a lesson about the production of a deadly nerve gas when he steals a can of the substance.
A political refugee gets a unwilling helping hand from Frank when he creates a change of identity to help flee the country.
A former motorcycle officer who was disabled when a thief tried to steal the payroll from an armored car, seeks Frank's help for the purpose of exacting his revenge.
Stolen precious artifacts from a church in Mexico, has Cannon in search of three suspects.
Cannon discovers that a man is posing as the son of a wine maker is likely the suspect of the three death attempts already tried against his "father."
A doctor who is conducting a medical research project at the state prison is the victim of harassment.
An ex-con is threatened when his safe cracking skills are needed for a theft of 1 million dollars.
The parents of a teen girl hire Cannon when they discover a charismatic young man is trying to lure their daughter into a cult.
A suicide by a pilot leads to the discovery of a plan by a mercenary group to launch a coup of a small African country.
Cannon is hired by a man who is charged with arson and murder by burning down his textile company which killed his wife who was trapped inside.
Cannon is hired when a young brother of a gun manufacturer and collector vanishes from sight.
A young convict is being harassed by a prisoner who is running a gambling operation inside of the lock up.
Public prosecutor Mike Arnold needs Cannon's help. He is suspected of the murder of his wife. His problem: Dubious friends want him to finish a corruption investigation.
A trade union boss dies in the mountains of Colorado. His daughter believes it was murder and hires Cannon to investigate. While the detective is inspecting of the scene someone pursues him.
A paramilitary troop wants to rob the income of a football stadium. In search of one of the gangsters Cannon approaches the gang and pretends to want to take part in the foray.
Lawyer Jane Butler is threatened. She is told to give up the defense of two burglars. When the menace becomes incendiary the lady begins to fret. Jane asks for Cannon's help.
Frank Cannon believes that this time he has accepted a peaceful job. He must protect the bar of a friend, Millie Carroll, against robberies. However, suddenly he finds himself amid a complex love story.
An illegal immigrant from Mexico has died in a coyote's case. Sheep grower Rita McBain is accused of the deed. Cannon must prove Rita's innocence and deal with a human smuggler ring.
Dr. Simeon is accused by orderly Duran of stealing drugs in the Metropolitan Hospital . Cannon has to find out whether this is right.
Paul Stubber taps the computer of the railroad company to be able to rob cars with valuable goods. However, nothing can be proved against him. Cannon finds Stubber's weak spot: The crook fights for the right to keep his son.
Frank Cannon is hired to search missing rancher Dale Lucas following his wife's order. He notes that the guard service of the ranch has been replaced.
Reporter Molly Stoner needs the help of her friend Frank Cannon. The police wants to take her in coercive detention. Molly affirms that infamous gangster Benje Canto has been murdered. Yet her source cannot be revealed.
Mrs. Manning, a former policewoman, hires Cannon when her husband becomes the victim of blackmailers. The man is an electrician specialized in wiretapping. Three criminals find that the electrician has recorded one of his conversations.
Bill Coates, Cannon's old friend, a boat builder, finds himself charged in his son's hunting-accident death. Unbeknown to Coates his lawyer is the man behind the homicide.
Cannon faces a mob kingpin threatening the life of a gambler's wife. Toby Hauser has accumulated 200,000 dollars in game debts. When he hides away his wife asks Cannon for help. Toby wants to put everything on a map. This game should be his last. Either he wins, or he dies.
A smuggler is attacked by mobsters interested in learning where he has hidden his booty. He escapes in Raymond Durstin's gallery. He turns to Cannon.
Gordon Bell gets involved in a fight. When his opponent dies, Gordon is arrested and charged with murder. Cannon has to bring the truth to light . The corpulent detective soon discovers that Gordon is only a pawn in a devilish scheme.
A murderer believes there's no other way out than putting the blame of a crime he committed on his sister, a retarded girl.
A writer was murdered. His latest book would deal with the biography of an industrialist. Cannon must protect the co-author and investigate the activities of the industrialist.
A young girl turns up dead at the yacht party thrown by two jet set brothers, Edgar and Norman Bruce. Her father, George Able, wants to exact revenge, but before he can even get close to the siblings he is beaten up by his henchmen. Cannon is hired by Abel's second daughter.
Cannon investigates a kidnapping case. The lawyer David Rackham has been abducted. Because he is diabetic and needs a certain drug, Cannon questions the pharmacists of the surroundings.
Tim Jardine was persuaded by his friends Amy and Claude to blackmail his father for 50,000 dollars. Nevertheless, Jardine's father is facing bankruptcy and Claude loses his patience and becomes a criminal.
Publisher Quigley asks Cannon for help. He believes that hotel proprietor Rawdon has killed six girls. When the seventh victim is found, however, it's Quigley himself who becomes the prime suspect. A lab assistant manipulates the samples used in the framework of the murders.
A serial murder targets Cannon as his next victim. At first the homicide wanted to be finally released from his compulsion to kill. Cannon accepted to help him. But Cannon got too involved in the the killer's demands.
A lady journalist is forced to reveal her sources in a murder news or she will go to jail on a contempt charge. She enlist Cannon's service to unravel the murder of a missing excursionist.
A rich lady, Cecilia Lasher, hires Cannon to locate the son her husband abandoned years before. She turns to Cannon after being blackmailed and terrorized.
Frank travels to a small ranching town to help out a writer friend charged with a double murder. Frank's only clue is a cryptic note left by the man's wife.
Frank struggles to prove his friend did not commit murder, but someone (the real killer) is working equally hard to thwart him.
A dead man hires Cannon! The man's will requires than an investigator look into his death, so Christopher Grant hires Cannon to see if any of the man's scheming relatives might have helped him to an early exit.
A man hires Cannon to find out who is using trained dogs to kill the man he served with in Vietnam, and why. It might have something to do with the unit's commanding officer, permanently disabled, perhaps by his own men.
A mob killer murders Cannon's client. But the killer is someone Cannon will never suspect, and that leaves him unprepared when he is accused of the crime.
Cannon tries to extract reporter Peggy Angel from a clever frame. Who is the real murderer, and why frame this particular person?
When a plane carrying three million in negotiable securities vanishes, the insurance carrier hires Cannon to find out what happened to it.
A murderer confined to a psychiatric hospital escapes. He's looking for his wife, whom he believes framed him for murder.
The victim of a burglary hires Cannon. He's sure he knows who stole $50,000 from his wall safe and only needs Cannon to prove it. The problem is, the suspect was in jail at the time of the robbery!
After a model ends up dead, the man last seen with her hires Cannon. He insists the girl was alive when he left her, so Cannon starts to dig - and turns up quite a collection of motives.
When a counterfeiting suspect escapes custody, rumors fly that Jim Farragut, the cop in charge of him, succumbed to either greed or cowardice. Jim's an old friend, so Cannon agrees to find a witness Jim claims can prove that he neither took a bribe nor experienced a failure of courage.
Mobsters kidnap Judge Hayes's daughter, on the orders of their boss who is on trial in Hayes's courtroom. Cannon must find and rescue her before the judge is forced to preside over a miscarriage of justice.
Socialite Doris Hawthorne's fiance disappears. Only then does she learn he was actually married to a Swiss woman, and also a blackmailing extortionist with a long list of enemies, many of whom want his files.
Frank agrees to look into a murder, convinced the Indian suspect did not commit the crime. His investigation unearths dozens of missing Indians and a drug smuggling ring.
Years earlier, Mel Danvers organized a successful hijacking and walked away with a cool million. But there is a witness: a stewardess. Danvers engineers a campaign of terror to keep her mum, until Cannon puts a stop to it.
Boxer Ron Johnson's manager convinces him that he killed a man in a barroom brawl, and uses that control to get the fighter to throw a bout so he can collect a fortune in unfair wages. Johnson's fiancee hires Cannon to dig him out from under.
General O'Hara, now a mercenary, hires Cannon to find his brother's killer. But the mercenary knows more than he's admitting, and Cannon finds himself in someone's cross hairs.
Cannon delivers a ransom, but the deal goes bad and Cannon winds up with no memory of the event, kidnappers on his trail, and people willing to exploit his lack of memory.
Reclusive Virginia McKellar insists her sister did not die five years earlier, as everyone believes, and she'll willing to pay Cannon to prove it.
The man who arranged the death of an embezzler cannot find the loot. But Cannon might, when he investigates on behalf of the man framed for the murder. But Cannon's client might be closer to the case than he lets on.
An expert hunter and gamekeeper dies, mauled to death by a lion that was supposedly tranquilized. His widow hires Cannon to figure out what happened and who is responsible.
"Reverend" Will can heal the sick by the power of faith. Or can he? Either way, his "powers" won't keep a witness to murder from coming forward, and that means... another murder.
A young dancer who teaches at a lonely hearts club winds up dead. One of his clients hires Cannot to find out who killed him. It isn't long before Frank discovers the dancer was also a con man who had bilked several women out of their life savings. And that lengthens the list of suspects considerably.
Kathy Ackers hires Cannon to find out why her father, a banker, committed suicide at a Caribbean resort. She thinks he was murdered, and wants Cannon to prove it. But the man was embezzling from his own bank, so maybe he did have a motive to kill himself...
Private eyes so rarely get a vacation free of peril, and Cannon is no exception. He goes fishing, little knowing that someone from his police past is hunting him: a murderer determined on revenge for the time he spent in prison.
A former prostitute aids Cannon in an investigation involving mobsters.
Cannon is in a full blown jam when he gets mistaken for the assassin of a bishop.
Cannon stirs up a hornet's nest worth of trouble after re-opening the case of an old shooting.
Cannon gets hired to be a bodyguard for a courier of securities.
A military general hires Cannon to find the daughter he put up for adoption years ago but it appears as though someone doesn't want the girl to be found.
Cannon is hired by a Cuban exile to investigate the death of the man's brother at the hands of law enforcement officials.
Cannon takes on a missing person's case which leads to the death of a policeman.
Cannon is hired to investigate a suspicious automobile accident in which there was a death.
Cannon is on the case when a psychiatric patient is accused of rape and murder after falling in with some unsavory companions.
Cannon aids a Dutch Nazi hunter on the trail of an SS officer who escaped Allied custody after the end of World War II.
After taking the case of a missing groom, Cannon discovers that things aren't exactly as they first appeared to be.
A former POW is the target of one of his former officers who's afraid of his cowardice being revealed.
Cannon helps fake the murder of a mobster in order to allow the man to testify against his boss.
Cannon travels to a small town in Texas to investigate a young girl's suspicious death.
A lawyer tries to escape from a crime syndicate that wants him to assume room temperature.
Cannon gets hired to protect a girl but when her supposed pursuer is found dead he finds himself charged with murder.
A contractor who refused to pay bribes to crooked politicians gets charged with murder. He hires Cannon to try and clear his name.
An ex-convict boards an airplane in Atlanta for a reunion with his daughter but when the plane lands he's nowhere to be found.
Cannon is a victim of mistaken identity and later almost killed.
Cannon is called in to investigate police corruption by the mayor of a midwestern town.
After witnessing a murder, a woman flees to a sanitarium where she was once a patient. It's up to Cannon to find her and keep her safe.
A former convict gets Cannon to help him find the man who sent him to jail for no reason.
Cannon is recruited as the go-between when Palestinian terrorists kidnap the daughter of an Italian industrialist.
Cannon tries to find a girl who went missing after witnessing a murder.
A friend and comrade of Frank is believed to have committed suicide.
Cannon receives a confession from a dying hitman who says he was responsible for the murder of his wife and daughter 14 years ago.
Frank Cannon and Barnaby Jones team up for an investigation of a murder at a big corporation in which a deliveryman was charged with the crime.
Cannon investigates a doctors claim that he is innocent of a death he was charged with concerning a patient he was treating that had slipped into a diabetic coma.
Cannon reopens an investigation when he discovers a convicted man may be innocent, but then refuses parole.
Cannon investigates the story from a beaten woman who's friend, a famous pop singer, has disappeared somewheres in the Hollywood Hills area.
With the help of his former police partner, Frank is asked by his former captain to reopen a case of a corrupt cop who has reappeared after being declared dead years ago.
A group of terrorists have drugged Cannon with a poison, giving him 72 hours to give them a defector and receive the antidote or die.
As a last request, Frank's former police mentor has asked him to go to Mexico and retrieve his son.
Cannon has been hired when a VP of a petroleum company is charged with misappropriation of funds and faces dismissal and prison time.
Cannon investigates when an heiress finds an ax buried into the head of a snowman outside of her home.
Cannon is asked to find out if a judges fiance is responsible for him being compromised.
Frank investigates the death of a gang member, who seems to have been killed by the son of a General and war hero..
Cannon is sent to investigate when a black community leader is murdered, just as he was to reveal a wrong doing.
Frank is hired when the son of a former Hollywood movie star suddenly disappears.
Frank Cannon finds out that Terry is pursued because of some snapshots he took. With the help of the photos Cannon gets in the dark zone between organized crime and high politics. And this becomes extremely dangerous for him.
Cannon is hired when the only witness to a robbery is a young child who blames an Arabian heir for the crime.
Cannon is hired when a crusading newspaper editor is found near a dead body, while drunk and unconscious in a hotel room.
The accountant of Eden corporation has disappeared. And along with him three million dollars. Does unscrupulous branch manager Sheffield have have to do with the plot? Cannon comes across a discovery and suddenly local reporter Julie Foster also plays an important role.
Cannon is haunted by the memories of his time in the Korean War.
A kidnapping with shady overtones compels a millionaire to hire Cannon for the investigation.
Cannon investigates the mysterious death of a scientist who was killed by a laser beam.
Cannon investigates when a former hitman seems to now be on someones wanted list.
Cannon investigates the shooting death of the girlfriend of a former basketball star.
Cannon is hired by the wealthy family of a young man, who is assumed to have died from an accidental death in Acapulco.
Cannon is hired to investigate when an Army researcher seems to have gone insane for no obvious reason.