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 remember how they first met and fell in love in the midst of murder and international intrigue in the picturesque locale of London.

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.

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.

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

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

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.