Wealthy couple Jonathan and Jennifer Hart, a self-made millionaire and his journalist wife, moonlight as amateur detectives.
When Jonathan breaks up a semi-slavery ring, the manager running it sends a hit man to pretend to be Jennifer's cousin and terminate her.
A yacht trip becomes dangerous when one of the Harts' guests is blackmailed into running drugs.
An innocent woman is blackmailed by her ex-husband into using their son to extort money from Jonathan.
When Jonathan buys Jennifer a gorgeous old car for her birthday, she is less than thrilled -- but two Brits seem suspiciously eager to take it off her hands.
A young woman working at Hart Industries becomes obsessed Jonathan and mimics Jennifer's appearance to replace her.
Two of the Harts' friends are suspects in the murder of a famous divorce attorney -- and they aren't answering Jennifer's and Jonathan's questions.
When a prostitute is murdered, one of Jennifer's former sources asks her to investigate.
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.
Two chemists at one of Jonathan's subsidiaries have developed a new hallucinogen, and their supervisor is killed when he tries to report them to Jonathan.
The Harts receive a last minute invitation to the wedding of Jonathan's old girlfriend and discover she is being forced into a marriage to an old nemesis, Alex Constantine -- unless she wants her injured brother imprisoned for two deaths he didn't commit.
A man collapses at the Harts' restaurant table and asks them to protect the man with jade eyes and take him to the temple.
The man who was painting Jennifer's portrait dies, supposedly while driving drunk, but the Harts don't believe the official explanation.
The old woman who runs the newsstand in Jonathan's building is being blackmailed for a murder she may not have committed --- that of her dead grandson's academic mentor... and drug supplier.
At the haunted house recently purchased by the Harts' "weird" friends Fred and Amanda, a dinner party turns into a deadly treasure hunt.
Freeway, the Harts' dog, has got a new girlfriend, and when her master is killed Freeway disappears with the gun – but doesn't have it when he gets home.
When Jennifer overhears an acquaintance planning to murder his wife on the ski slopes, she and Jonathan jet off to Vail to prevent it . . . but the wife isn't the one who winds up dead.
When a researcher is kidnapped in a South American country by an old adversary of Jonathan's, Jonathan undertakes to personally deliver the ransom and ensure the safety of the researcher and his pregnant wife.
A precognitive young woman sees herself being murdered, but it is her unknown twin sister who turns up dead.
Hairdresser Barry styles the hair of the creme de la creme. But when his clients wind up blackmailed to pay Barry's loan shark, can the Harts help Barry break free before someone else winds up dead?
A diamond theft on a cruise ship owned by Jonathan leads the Harts to join the cruise ship to catch the thief---who may be taking orders from ship crew members.
Maurice, a famous French chef and chemist, has created something world changing and wants to distribute it through Jonathan's company, but before he can tell Jonathan about it, he is killed and his recipes stolen.
Marital suspicions lead a woman to accidentally kill her husband, but when his debt ridden brother tries to step into his place, the Harts blow his cover and the widow may take her own revenge.
Vacationing in New York City, the Harts look forward to a nice lunch with Jennifer's friend and her new husband, but her husband suddenly disappears and is shortly found dead. Meanwhile, two men who followed him out of the restaurant next show up in his L.A. apartment and start following who they think is his wife: Jennifer.
After witnessing a young woman's murder unexpectedly through a telescope in his friend's business office, Jonathan stumbles trying to pursue and catch the killer but hits his head and loses his memory. As he tries to recover he suspects the dead woman may have been his own mistress---and that he might have killed her.
Jennifer has a doppelganger, married to a man who let his old partners take the fall for a robbery. The doppelganger reluctantly agrees to help Jonathan after Jennifer is kidnapped by one of the partners demanding a share of the crime's proceeds.
Freeway is chosen to star in a new dog food ad campaign, but the creator has a secret ingredient and will kill to hide it.
Jennifer and Jonathan go undercover to identify a toy plan thief who has become a murderer.
An Egyptologist is killed just before the opening of a stagey exhibit, featuring the mummy of an ancient Egyptian prince who legend says is waiting for his princess to join him in death -- and she looks just like Jennifer.
Jonathan and Jennifer are in Hawaii for a croquet tournament when a tournament official is stabbed, and the Harts wind up in an international dilemma involving the KGB, MI-6, the CIA, and a fancy key that may unlock deadly secrets.
When Max's long dead ex-wife suddenly reappears, kidnapping and a hot diamond necklace are not far behind.
Scalped stolen opera tickets land Jonathan in the middle of a plot to assassinate the DA who is fighting organized crime.
The Harts want to give their charity committee gourmet chocolate hearts as a thank-you, but when one turns out to have been part of a smuggling operation, can Jonathan and Jennifer figure out what is going on before someone tries the "special" chocolates from an unknown admirer?
Hart Industries's industrious but slightly awkward chief accountant Stanley Friesen is set up to take a murder rap 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.
It's roundup time at the Harts' ranch, but Jonathan and Jennifer are distracted by dying animals, a rumored chemical spill orchestrated by a Texan hoping to strip mine valuable coal from the area, and a murder in which the local sheriff may be involved.
A used bullet hidden in their house by a new Hart employee leads to a cat-and-mouse evening with a murderer.
A scramble for a smuggled barbell highlights a health center opening attended by the Harts and several bodybuilders.
To catch a group of counterfeiters who murdered an investigator, Jennifer and Jonathan go on a cruise, she posing as a European countess and he working as a ship's steward.
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.
After a young model is killed at a fashion party, Jennifer and Jonathan agree to pose for a fashion shoot that leads to another murder. But Jennifer may have been the intended victim.
Jennifer suffers a concussion in a fall at the park, meaning no one but Jonathan believes she witnessed a patient's murder in a small hospital where her debt ridden doctor is part of a scheme the FBI has been investigating several years.
When a playwright friend of the Harts' is killed and the Harts' copy of his last work is snatched, Jonathan is convinced something in the play motivated the murderer.
After discovering their house burgled, the Harts find a hidden room---and learn the original architect/owner kept a fortune in bonds in that room, a fortune targeted by a young broker at the finance firm where the architect did business in his younger years.
Max creates a rose hybrid he calls the Jennifer Hart Rose and enters it in a prestigious contest under Jennifer's name. She becomes the target for murder when she is stalked by a psychotic leading judge.
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.
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 closet, the Harts become involved in protecting a government witness from would be assassins.
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.
A magician and his brother, who has had surgery to look just like Jonathan, plan to replace him and gain control of the Hart empire.
An eccentric art collector has become infatuated with Jennifer, and traps her and Jonathan in a glass cage.
The Harts new musical investment, singer Lorene Tyler, is beginning an international tour. The singer's husband Jesse, a jewel thief, has a costume made for her that sparkles with diamonds disguised as rhinestones. After the outfit is loaned to Jennifer, Lorene's husband is desperate to retrieve it.
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.
Max is kidnapped to force the Harts to throw a race in which their thoroughbred is running.
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.Note: This episode aired 37 days after Robert Wagner's wife, Natalie Wood, drowned off Santa Catalina Island.
The Harts visit the gallery of a well known stamp collector to see the Vermillion, the most valuable stamp in the world. The Harts inadvertently gain possession of the stamp and their lives are in danger.
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 conspiracy by an unhinged German man seeking revenge for his own father's death.
After the owner of the beauty salon she's visiting hypnotizes her into stealing valuable baubles from her friends as well as the jewelry store, Jennifer is branded a jewel thief.
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 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.
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 renowned Soviet dancer 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 escape to their mountain cabin, and get involved in rescuing a young friend who's being framed for murder by the local sheriff.
The CIA asks Jonathan to pretend to be an agent to uncover an information leak.
A friend of Jonathan 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'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 valuable rare coin.
Jennifer appears to be at fault in a minor accident, but it was actually staged by the victim attempting insurance fraud. She and Jonathan are shocked when the victim dies due to complications, and then are sued by the grieving widow.
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.
Jennifer's aunt weds for the seventh time, but the groom dies while eating wedding cake.
During a trip to London with Jonathan, Jennifer reluctantly becomes both lady luck and carrier pigeon to a mysterious baron whom she later learns has spirited a fortune away from the British government -- and she's holding the bag that everyone wants!
Jonathan faces danger at Jennifer's reunion when a man from her past decides to be the only man in her future.
At a theme park the Harts witness the death of a stuntman who is shot with a gun that was supposed to be loaded with blanks.
The Harts are unwillingly involved in a deranged fan's fantasy after Jennifer agrees to help her old professor by impersonating as the author of his novel.
Max is duped into thinking he won a million dollars, and he 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 and replaced with a worthless look-alike.
Jennifer goes undercover at an exclusive women's only fitness center, and gets caught up in a murderous plot to defraud wealthy widows.
A jingle-gram company serves as a front for an organization of burglars targeting the Harts and other wealthy families.
A big game hunter plans a jungle revenge after Jonathan bests him in a major business deal.
The suspicious death of one of Jennifer's former students turns the Harts' getaway weekend into a murder investigation.
Freeway, Max, and the Harts find themselves in the middle of a drug smuggling ring.
The death of a Hart Industries geologist in the Peruvian jungle leads to a plot to exploit a lost Inca treasure.
A woman's plan to sell her husband's perfume firm to Jonathan leaves her a widow.
Jonathan and Jennifer travel to the Bahamas to meet with a recluse, and discover that his assistant has replaced him with an impostor 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.
The Harts must find vacationing Max after accidentally giving him a lethal cigar as a going away gift.
A hitwoman kills a commissioner and ends up taking Jonathan, Jennifer and Max hostage.
A psychotic woman is obsessed with Jonathan and is killing anyone who gets in her way.
Art forgers are replacing masterpiece paintings with fakes and the Harts take action to trap them.
An exercise routine and nutritional supplement is more than it seems, when Jennifer's cousin suffers a heart attack after only a week in the program.
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.
An emerald stolen by an Argentine polo player ends up in Jonathan's possession. The thief succeeds in getting it back, but Jonathan foils him in the end.
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.
Jonathan serves as a radio operator for a test mission of a top secret new radar system on a flight that has been set to explode.
The Harts have been invited to England by Sir William Belgrave to participate in a fox hunt. When Sir William is killed while trap shooting, the Harts find themselves looking for a murderer while avoiding being killed themselves.
A tennis pro romances wealthy clients and passes data from them to a crooked stockbroker.
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.
A greedy relative of a deceased Scottish chieftain battles to succeed the late clan leader but must compete with Jennifer for the title.
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.
Lisa has been in a coma for seven years after she was in a car accident that killed her parents. The Harts take her in for a few days to help her recover. However, not everybody wants her to remember what happened.
Jennifer witnesses the murder of a mob boss by his rival and the murderer vows to kill her. The police protection fails when there is an attempt on her life so Jonathan takes matters in his own hands and they decide to hide in a convent.
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.
The Harts help Max search for his friend, missing after being victimized by con men.
The Harts encounter industrial espionage when they agree to care for a dog carrying an important biogenetic formula.
The Harts enlist skaters Tai Babilonia and Randy Gardner to assist an Olympic hopeful marked for murder.
On the Greek island of Rhodes, the Harts become entangled in a smuggler's plan to steal ancient artifacts.
Jennifer's part in a commercial could be her swan song unless Jonathan can stop a deranged man who has rigged a camera to explode.
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' videotape of a skiing vacation sheds some light on a champion skier's death on the slopes.
Max's pen pal pays her first visit to the Hart residence. However, Max embellished his station in life and claimed that he had the mansion and the money. As a favor to Max, the Harts decide to exchange roles and become Max's servants. The debt ridden nephew of Max's pen pal believes Max is rich and comes to steal some of his fortune.
In order to save Max's life, Jonathan and Jennifer join a criminal's elaborate scheme to steal $20 million in gems.
