
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.

The Harts are the next target of a ruthless tycoon who ruins ranchers by poisoning livestock; guest Jane Withers.

The Royal Canadian Mounties come to the rescue when a killer aiming to destroy evidence holds the Harts.

A scramble for a smuggled barbell highlights a health-center opening attended by the Harts and several bodybuilders.

Jonathan poses as a steward and Jennifer as a countess when they embark on a gambling ship to crack a counterfeiting ring.