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.

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

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

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.

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.

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.

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.

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.

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.

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.

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 before his memory returns.

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 of the strange crime is being covered up.

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

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

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.

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 life.

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.

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.

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 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.

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

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.

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 using the Nightlife as a cover.

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