
Self-made millionaire Jonathan and freelance writer Jennifer are the Harts - a globetrotting married couple with a talent for finding mysteries wherever they go. And even when they're uncovering thefts, espionage and assorted skullduggery, they still find time for romance.

Jonathan and Jennifer's home is ransacked by a stockbroker looking for the secret passage to a forgotten fortune in lost bonds.

A mishap in Acapulco finds the Harts posing as servants to prevent a murder; guest Rene Enriquez.

At their mountain retreat, the Harts aid an innocent caretaker framed for murder by a local sheriff.

On a train trip, the Harts investigate an undercover police officer's death; guest Carol Lynley.