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.

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.

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.

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.

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.

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

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

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

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 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.

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.