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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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

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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.

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

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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.

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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.

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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.

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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.

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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.

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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.

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

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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.

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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.

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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.

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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.

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