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.
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.
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.
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.
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.
Jonathan and Jennifer are stalked by dangerous industrial spies after they are entrusted with a dog that happens to be carrying a valuable biogenetic formula.
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.
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.
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 security.
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.
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.
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.
Jonathan teams with tennis great Martina Navratilova in a game of doubles aimed at exposing a deceitful tennis pro and the stockbroker who is blackmailing him.
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.
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.
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 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.
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 decides to purchase his and Jennifer's Honeymoon 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 and the Napa Valley.
The Harts face a $2 million wrongful death suit when a fender bender results in a driver's death. The couple immediately suspects insurance fraud, which leads them to a crooked lawyer.
Jennifer's 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.
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.
Jonathan's new suit has been switched with another. To save time he decides to make the exchange himself rather than through the tailor. At the other man's hotel room, Jonathan and Jennifer discover a body.
The Harts just want the solitude of their mountain cabin for a weekend. Instead, they end up trying to rescue their caretaker who has been framed for murder by the local sheriff.
Jonathan's vineyard partner discovers that their wine, Hart-Cabri, is being sold as the more expensive Chateau St. Claire. When Cabri is murdered, the Harts investigate the fraud and murder.
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.
A remote Island, an exotic European chateau, and the mysterious disappearance of a publisher they were supposed to meet on the French Riviera, are not what the Harts anticipated when planning their romantic getaway.
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.
After the owner of the salon she's visiting has hypnotizes her into stealing valuable baubles from her friends as well as the jewelry store, Jennifer is branded a jewel thief.
Jennifer's reunion with her father in Washington D.C. is laced with danger and surprise when she learns he was an intelligence officer in World War II and is now the target of an assassination by a German man who blames him for his father's death.
The Harts visit the gallery of a well-known stamp collector to see the Vermillion, the most valuable stamp in the world. However, they soon gain possession of the stamp, and find their lives are in serious danger.
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 a Navy SEAL working on the project washes on shore.
J.J.Hart, 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. Meanwhile, Max finds little Riley both smart and charming, but she soon ends up in danger when she witnesses a murder in a stall.moreless
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. After Jonathan is rushed to the hospital, the unexplained attacks continue.
The Harts new musical investment, singer Lurene Tyler, is beginning an International tour. The singer's husband Jesse, a jewel thief, has a costume made for her that sparkles with diamonds. After the outfit is loaned to Jennifer, Lurene's husband is desperate to retrieve it.
The Harts get trapped in a glass cage by an eccentric art collector. However, they only want Jennifer, not Jonathan. 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.
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. After another woman is killed, Jonathan wants the ads ended to protect Jennifer from any danger.
An Air Traffic Controllers' strike forces Jennifer and Jonathan to take a train from Chicago to Los Angeles. When Jennifer discovers a dead body hidden in their compartment, the Harts become involved in protecting a government witness from would-be assassins.
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 assassination.
Max creates a rose hybrid he calls the Jennifer Hart Rose and enters it in a prestigious rose contest under Jennifer's name. She becomes the target for murder when she is stalked by a psychotic leading judge.
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 claim the municipal bonds hidden in the vault.
Jennifer's death scene in an amateur production could become the real thing when the director realizes she can identify him as a murderer of a young playwright.
Jennifer, flying a kite in the park, falls and hits her head. She's hospitalized with a slight concussion. While in the hospital, she witnesses the murder of another patient and tries to convince Jonathan of the strange crime is being covered up. However, no one believes her.
Jennifer's article on the world of high fashion leads to Jonathan and Jennifer modeling for a famous photographer while trying to determine who is murdering beautiful models.
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.
Jonathan and Jennifer set sail, incognito, on a gambling ship in an attempt to crack a counterfeiting ring which happens to be passing the money as winnings in the gambling room.''
Vince, a friend of Max's, arrives in the United States to open a chain of health clubs. International criminals smuggle a solid gold barbell into the country with Vince's entourage.
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.
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 Jennifer's colt is poisoned.
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 act as singles) which leads them to discover a gambling ring using the Nightlife as a cover.
Jennifer orders three chocolate valentines from Mrs. Bittersweet. Someone makes a mistake and delivers the wrong heart for the Harts. One contains a smuggled object that the thieves want at any cost.
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 victim's life.
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 kidnapped. Demands are made for a necklace about which the Harts know nothing.moreless
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.
During an Opening Night party for a new Egyptian 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 home.
Industrial espionage is a problem at Hart toy company, thanks to a toy robot. 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 destruction.
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 behave as if drugged. Jennifer and Jonathan are in danger when they attempt to find out its secret formula, that was created by a veternarian to make animals become addicted.moreless
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 save Jennifer.
Jonathan witnesses a murder through his telescope, but in the rush to approach the scene of the crime, he is hit by someone on a mo-ped which results in temporary amnesia. Now, the killer must get rid of Jonathan before his memory returns.
When a bridegroom disappears abruptly and leaves his wife, who happens to be an acquaintance of Jennifer's, the Harts step in to help her find him. However, there is no tangible evidence that he exists.
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.
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 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 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 target of a deranged killer.
The Harts are asked to ransom two scientists employed by Hart Industries after they are kidnapped in South America. This leads Jonathan, Jennifer, and Max mounting a midnight raid against the wealthy and powerful kidnapper.
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 jewelry shipment.
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 victim.
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 shady art speculator.
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.
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 foil the wedding plans allowing Nikki to marry the man she really loves.
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 and swift changes in temperatures.
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.
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.
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.
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 young boy shows up at the Hart's 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 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 friend of millionaire Jonathan Hart appears to have committed suicide whilst returning home from The Golden Goose Health Spa. He is joined undercover by his wife, Jennifer, as they try to find out what really happened.