A dying prisoner, a former hit man confesses to Cannon that he killed his wife and child 14 years ago when Cannon was a cop. Cannon investigates to find the person responsible while trying to control his desire for revenge.

Frank Cannon and Barnaby Jones investigate the rape and murder of a young woman who was about to blow the whistle on the company she was involved. But they are investigating for different clients and from totally different angles.

A doctor treats a diabetic in the emergency room and she then dies. He claims that the patient was wearing an indicator bracelet that has seemed to have vanished. Cannon is hired to investigate.

Cannon reinvestigates a 10 year old murder from when he was on the police force and begins to question if the man in prison is really innocent.

Cannon is hired to find a popular recording artist who he believes is being held against her will. But when he finally finds her he begins to understand that there is a much more sinister reason for her being kept from the outside world.

Cannon teams up with former officers who were on the force the same time he was. Their task is to find another colleague who they believed was dead for the past eight years, but now suspected of killing those he was involved with in crime.

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.

An old friend hires Cannon to bring back the body of his dead son from Mexico and to find his killer. Cannon agrees, but he uncovers a few surprises in the process.

Cannon investigates on the behalf of a oil executive who claims he is being framed for fraud and embezzlement. But he runs into heavy resistance in his investigation from the corporations domineering female president.

Cannon unravels a murder plot that was made to look like it involved the Chinese Tongs gang. But the intended victim turns the tables on the real man behind the plot and try's eliminate Cannon in the process.

Cannon and a female vice squad officer who's on leave after being viciously beaten while undercover posing as a prostitute go after this same man who has previously beaten prostitutes to death while playing the music "The Wedding March".

Cannon protects a man and his wife from the members of a small motorcycle riding cult that are bent on avenging the death of one of their own.

Cannon investigates the possibility that there is a conspiracy behind the assassination of a black female politician.

When the son of a famous actress disappears the police think its another instance of his recurring drug problem. Cannon is hired to find him, but no one is telling him the whole truth.

The mastermind behind the kidnapping of an infirm prince is also the man helping Cannon with his investigation.

Frank Cannon takes up the case when it appears that the head of a newspaper is being framed for the murder of a prostitute.

A small town newspaperman takes on a dual identity and fakes his own murder. Cannon is hired by his wife to investigate.

Cannon becomes a hunted man when a young South Korean man comes after him seeking revenge for his late father who was a tortured prisoner of war during the Korean War-and he believes Cannon is solely responsible for it.

Cannon investigates when the grandson of the billionaire fakes his own kidnapping to get his trust fund money, but get gets involved with the wrong type of people.

Cannon investigates the death of a scientist who designed a computer that searches for extra terrestrial signals. But was he murdered by an entity from outer space or by a fellow scientist with something to hide?

A mobster hires Cannon to find out who tried to kill his ex-wife in a failed hit attempt. But Cannon suspects the mobster himself may be the actual target after another attempt is made on him and not his ex-wife.

Cannon investigates the murder of a woman who was the girlfriend of a professional football quarterback.

The nephew of a tycoon commits suicide, but he suspects foul play and hires Cannon to investigate.

An Army officer showing signs of a deep psychosis is on the loose with an M-16 rifle somewhere on base. His wife calls Frank Cannon in to investigate and to help bring him in before the Army is forced to kill him.