After extending her hospitality to a young author claiming to be a distant cousin, Jennifer experiences a series of near fatal accidents.

The Harts south-of-the-border boating holiday turns Jonathan and Jennifer into desperate fugitives, on the run from Mexican police and a gang of drug dealers.

A young boy shows up at the Harts gate in the middle of the night claiming to be Jonathan Hart, Jr. The child proves to be the unwitting pawn in his biological father's criminal plot.

The Harts become involved in the world of espionage when Jonathan purchases an antique car for Jennifer. A mysterious jet-setting couple will stop at nothing to acquire the classic auto.

A deranged woman who works for Hart Industries has an obsession for Jonathan. She sees Jennifer as a threat to her fantasies of love and finds it essential to eliminate her.

When a prominent lawyer is murdered, two close friends of the Harts are accused. Jennifer sets out to clear the wife while Jonathan attempts to absolve the husband.

An article written by Jennifer leads a prostitute to ask for her help and the Harts go under cover to bait a killer who is murdering prostitutes.

The Hart home is stripped of everything. It looks like an inside job and all clues point to Max's new love. When Max is framed for murder, the Harts intervene.

A Hart Industries chemist is shot and the Harts suspect a female scientist who has discovered a powerful new narcotic. Jennifer and Jonathan find themselves in a weather chamber subjected to brutal an…

The Harts are invited to the wedding of Jonathan's former girlfriend in Monte Carlo. She is being forced into a marriage to a power-hungry, ruthless, blackmailer. The Harts uncover the truth and help …

A dying man gives Jonathan and Jennifer an ancient Buddha statue. The Harts are then thrown into intrigue and danger when they are pursued by Chinese henchmen and a diabolic giant.

Jennifer has her portrait done as a gift to Jonathan for their anniversary. When the young artist is murdered, the Harts mingle in the high-society art world where Jennifer becomes the target of a sha…

The Harts suspect a college fencing champion of being behind a murderous drug ring. Jonathan fights a razor-sharp duel with the sadistic student.

The Harts are invited to a unique, off-beat party -- a treasure hunt at a haunted house. When another guest is murdered, the Harts race against time to find the murderer before someone else becomes vi…

Freeway runs away with a gun used to murder a wealthy neighbor. The Harts get involved in capturing the killer and intercepting a multi-million dollar jewelery shipment.

Intrigue in Vail lead Jonathan and Jennifer into the midst of severe bizarre murder plot, including an electrifying scheme against them.

The Harts are asked to ransom two scientist employed by Hart Industries when they are kidnapped in South America. When Jonathan, Jennifer, and Max, they wind up mounting a mid-night raid against the w…

The Harts have a deadly encounter when they enter the mysterious world of psychic phenomena. A Hart Industies employee with amazing powers of ESP, a twin sister, and a wealthy grandfather, becomes the…

The Harts uncover a scheme designed to blackmail wealthy patrons of a beauty salon.

The Harts take a luxurious cruise on a Hart Industries liner to investigate a series of jewel thefts. They find themselves at the mercy of the jewel thieves' rival burglars.

The menu features murder when the Harts take a gourmet cooking class. The Harts vie with an unscrupulous financier for a recipe which might benefit the world.

The Harts are caught up in a tangled scheme when a wealthy playboy attempts to take over the family fortune using his brother's wife as his unknowing pawn.

When a bridegroom disappears abruptly and leaves his wife, who is an acquaintance of Jennifer's, to face a couple of thugs by herself, the Harts step in to help her.

Jonathan witnesses a murder. In his rush to approach the scene of the crime, he is hit by someone on a mo-ped. The blow to his head causes temporary amnesia and the killer must get rid of Jonathan bef…

Jennifer is mistaken for her look-alike, Dominique, and is kidnapped by ruthless killers. With the help of an unscrupulous columnist, the police, and the real Dominique, Jonathan devises his plan to s…

Normally finicky, Freeway is quite fond of a new dog food and ends up in a dog food commercial. When the Harts have a party, some of Freeway's new food is mistakenly ingested by some guests who then b…

Industrial espionage is a problem at Hartoy company. When the investigator Jonathan has hired is murdered, the Harts go undercover in an attempt to foil the crooks and save the company from financial …

During an Opening Night party for a new Egytian exhibit at the museum, the man who discovered the tomb is murdered. The Harts become involved in the investigation when Jennifer sees a mummy at their h…

At a croquet game in Hawaii, a player is stabbed and dies at Jonathan's feet, muttering something about a key. Two of the spectators suddenly become interested in the Harts.

Max's ex-wife, presumed dead for over 10 years, arrives in Los Angeles. Her friend is murdered, so she calls Max for help. When two thugs try to grab her at the park, she is injured and Max is kidnapp…

At the opera, Jonathan is mistaken for a hitman and is given an envelope containing $100,000 for the job. When the messenger is murdered, Jonathan poses as the hitman in an attempt to save the victims…

Jennifer orders three chocolate valentines. Someone makes a mistake and delivers the wrong heart for the Harts. One contains a smuggled object that the thieves want at any cost.

Chief accountant of Hart Industries, Stanley Friesen, is set up to take a murder wrap after an evening on the town. In an attempt to clear him, the Harts retrace his steps and discover a gambling ring…

To strip mine the entire area, a ruthless mining tycoon is driving cattle ranchers out of business by poisoning the livestock via the stream that waters the properties. The Harts get involved when Jen…

An employee delivers some papers to Jonathan, along with evidence of a murder. She hides the clue in Freeway's toy and the Harts are held hostage by the murderer.

Vince, a friend of Max's, arrives in USA to open a chain of health clubs. International criminals smuggle a solid gold barbell into the country with Vince's entourage.

Jonathan and Jennifer set sail, incognito, on a gambling ship in an attempt to crack a counterfeiting ring.

The Harts' unscrupulous lawyer hires an assassin to eliminate Jonathan with plans to court and marry Jennifer and thus gain control of the sizeable estate.

Jennifer's article on the world of high fashion leads to Jonathan and Jennifer modeling for a famous photograper while trying to determine who is murdering beautiful models.

Jennifer, flying a kite in the park, falls and hits her head. She's hospitalized with a slight concussion. While in hospital, she witnesses the murder of another patient and tries to convince Jonathan…

Jennifer's death scene in an amatuer production could become the real thing when the director realizes she can identify him as a murderer of a young playwright.

The Harts return home and find their house ransacked. During the clean-up, they discover a hidden hallway and vault. The Harts and their friend Ida are sealed in the vault when the crooks return to cl…

Max creates a rose hybrid he calls the Jennifer Hart Rose and enters it in a prestigious rose contest under Jennifer name. She becomes the target for murder when she is stalked by a psychotic leading …

While vacationing in Acapulco, the Harts borrowed car breaks down. They ask for help at the nearby estate and find themselves posing as domestics, attempting to prevent a politically motivated assassi…

An Air Traffic Controllers' strike forces Jennifer and Jonathan to take a train from Chicago to Los Angeles. When Jennifer discovers a body in their compartment, the Harts become involved in protectin…

An ad campaign for a costly fake fur using high society ladies as models, including Jennifer, turns deadly when one of the women is murdered. Jonathan wants the ads pulled when a second victim is kill…

A Jonathan Hart look-alike, with the help of his magician brother, plots Jonathan's murder intending to take over the Hart empire.

A diamond ring given to Jennifer by Jonathan for their fifth anniversary enables their escape from a glass-walled room where they are being held captive.

The Harts new musical investment (singer Lorene)is beginning an International tour. The singer's husband Jesse, a jewel thief, has a costume made for her that sparkles with diamonds. The outfit is loa…

A psychotic man pours a blinding chemical into the Harts pool. Seconds after Jonathan dives in for his morning swim, he surfaces, screaming in pain.

JJHart, the Hart's filly looks like a winner. However, two men with a great deal riding on the upcoming horserace can't afford to have their horse beat.

Combining business with pleasure, the Harts scuba dive off the coast of Largos, testing an innovative underwater camera for the Navy. Early afternoon, as the Harts stroll along the beach, the body of …

The Harts visit the gallery of a well-known stamp collector to see the Vermillion, the most valuable stamp in the world. The Harts inadvertantly gain possession of the stamp and their lives are in da…

Jennifer's reunion with her father is laced with danger and surprise when she learns he is a retired government agent and the target of an assassination.

Jennifer has become a jewel thief. The owner of the salon she's visiting has hynotized her into stealing valuable baubles from her friends as well as the jewelery store.

On a restful trip to Maui, the Harts become involved in a murder when Jennifer hears the wife of Jonathan's business associate plotting to murder her husband.

A remote Island, an exotic European chateau, and a mysterious disappearance of an associate are not what the Harts anticipated when planning their romantic getaway.

Jonathan and Jennifer enact a troubled marriage in very public places in an attempt to flush out the culprit who is trying to cause a rift between them.

The Harts become involved in international intrigue when they infiltrate a ballet company to clear a world-renown Soviet danseur of murder charges.

While attempting to clear a friend of murder charges, the Harts become entangled in a disturbed woman's fantasies.

Jonathan's vineyard partner discovers that Hart-Cabri is being sold as the more expensive Chateau St. Claire. When Cabri is murdered, the Harts investigate the fraud and murder.

The Harts want the solitude of their mountain cabin for a weekend. Instead they end up trying to rescue their caretaker from a murder frame by the local sheriff.

Jonathan's new suit has been switched with another. To save time he decides to make the exchange himself rather than through the taylor. At the other man's hotel room, Jonathan and Jennifer discover a…

A friend of Jonathan's dies leaving his widow and son with a valuable assortment of baseball cards. Before the Harts can sell the collection for the family, it is stolen.

Jennifer purchase of a flower from a blind woman leads to an attempted kidnapping when the change she receives is not a quarter but a very rare coin.

The Harts face a $2 million wrongful death suit when a fender bender results in a driver's death. The Harts suspect insurance fraud.

Jonathan purchases their Honeymoom bed, but the wrong bed is delivered. In their search for the ""real"" bed, the Harts become entangled in an international art smuggling scheme through San Francisco …

The Harts witness a murder when the spiritual mentor and bridegroom of Jennifer's aunt meets an untimely death.

While waiting for Jonathan to finish a meeting in a London casino, Jennifer is used as an unwitting pawn to transport money to the United States by a Baron.

Jonathan joins Jennifer at her prep school reunion and is drugged by a former admirer who wants Jennifer for himself.

Jonathan and Jennifer are asked to buy a bankrupt ghost town.

Jennifer's former professor asks her to pose as a romance fiction writer during a promotional appearance.

Max is duped into thinking that he has won a million dollars and leaves the Harts to thieves who take over the house.

Jonathan and Jennifer try to help a king save his culture's golden statue after it is stolen by the king's assistants.

Jennifer finds herself in over her head at the Grey Gables Health Farm when the doctor is killing guests and replacing them with lookalikes.

Jonathan and Jennifer are robbed during a birthday party for Max and go undercover for Jingle-Grams.

While visiting a wildlife reserve, Jonathan and Jennifer are hunted as prey by a competitor of Hart Industries.

A young reporter influenced by Jennifer is murdered by her fiance's employer.

A drug trafficing scheme is ruined when Freeway's kennel is switched with one containing cocaine.

Jonathan and Jennifer stumble into a plan to steal ancient treasures from a South American archaeological dig.

Jonathan buys a perfume factory following the murder of the owner by his chemist wife and her lover.

Jonathan and Jennifer travel to the Bahamas to meet with a recluse and discover that his assistant has replaced him with an imposter to gain control of his fortune.

Jennifer wins a walk-on role on a soap opera which leads to a writing job that nearly gets her killed by the leading man.

Jonathan buys Max a lethal cigar and after accusing him of being predictible Max disappears, leaving the Harts to find him before it's too late.

A hitwoman is sent to kill a commissioner and ends up taking Jonathan, Jennifer and Max hostage.

A psychotic woman is obsessed with Jonathan and is killing anyone who gets her way.

Art forgers are replacing masterpiece paintings with fakes and the Harts take action to trap them.

Jennifer's cousin slips into a coma after being continually drugged by the owners of a health club.

Jonathan and Jennifer remember how they first met and fell in love in the midst of murder and international intrigue in the picturesque locale of London.

Jonathan thunders into the glamour and excitement of polo, unaware that he and Jennifer have become targets for murder in a smuggling scheme using a prized polo mallet to transport a $1-million gem.

Jennifer fears for Jonathan's life when ruthless jewel thieves take him hostage during a robbery while he's on a business trip in Paris.

Jennifer races to save Jonathan, who is serving as radar operator aboard a fighter jet rigged by a saboteur to explode during its top secret test mission.

A traditional fox hunt is marred by murder during the Harts visit to England -- and sends them off on the trail of a killer.

Jonathan teams with tennis great Martina Navratilove in a game of doubles aimed at exposing a deceitful tennis pro and the stockbroker who is blackmailing him.

While in Greece, Jonathan and Jennifer race to save their lives and the future of Hart Industries when a European business magnate seeks to destroy them during a cross-country car rally.

A woman claims to be Jennifer's half-sister and her father believes she could be the daughter of his nurse during the war. Jonathan, however, is suspicious and sets out to find the truth.

Jonathan and Jennifer's delightful excursion to the Scottish Highland games is laced with danger when Jennifer becomes the target of a man who is her rival for leadership of a world-famous clan.

The Harts lives are at stake when a valuable ancient jade carving leads them into the heart of mysterious Macao, where they encounter a Chinese arms dealer who has become a threat to U.S. national sec…

In keeping with the season's spirit, Jonathan and Jennifer take in a girl who learns that her parents died in a car crash that left her comatose for 7 years.

Jennifer takes refuge in a convent after witnessing a gangland slaying. Jonathan must race to save her when the killer discovers her hiding place.

Jennifer is stalked by a psychotic stage manager who lurks in the wings as the Harts don top hats and tails to perform in a charity benefit in the Big Apple.

Jennifer and Jonathan help Max seach for his lady love, who has fallen victim to a pair of money-hungry crooks.

Jennifer and Jennifer are stalked by dangerous industrial spies after they are entrusted with a dog that happens to be carrying a valuable biogenetic formula.

A young figure skater's dreams of Olympic gold will be shattered unless Hart Industries can mix modern technology with the astounding talent of skater Tai Babilonia.

While vacationing on the exotic island of Rhodes, Jennifer and Jonathan become ensnared in a scheme for the smuggling of ancient Greek artifacts and are nearly entombed in the process.

Jennifer takes on a glamorous modeling assignment, not knowing that the camera is rigged with an explosive device, as Jonathan races to stop the deadly scheme concocted by a vengeful man from her past…

Jonathan and Jennifer pose as a professor and a student in a dangerous scheme to expose the person responsible for the drug framing of Max's nephew, a college basketball star.

The Harts and Max are held at gunpoint when a murderer realizes that Jonathan has incriminating evidence linking him to the death of a champion skier.

The Harts and Max fear for their lives when the debt-ridden brother of Max's penpal believes Max is rich and comes to steal some of his fortune.

Max is taken hostage. The Harts scramble to save him by participating in a scheme aimed at robbing an international jewel salesman of $20 million in gems.