When Biff tries to help a young Polish boy recover his mother's diamond ring from a thief, he discovers a crooked ring of "gray marketeers" who prey on refugees in Marseilles.

While on a trip to Czechoslovakia, Biff and Louise attempt to help a U.S. Air Force pilot whose plane accidentally crashed behind the Iron Curtain.

The Reds are jamming Voice of America broadcasts into Vienna. Biff and Louise have to find out where the jamming is coming from so they can stop it.

The Bakers are invited to import some contemporary paintings, but they soon become aware that they are actually old masterpieces(including the Mona Lisa!) looted from great museums by the Nazis, now painted over to get them out of Europe by murderous art thieves.

While vacationing in the German Alps, Biff and Louise learn of a Nazi plan to counterfeit American money and try to find the missing plates that were used to print the twenty dollar bills.

The lingering aroma in a hotel hallway of a powerful scent put Biff and Louise on the trail of a ring on international smugglers.

While visiting Cairo, Biff is ordered to locate a stolen truck. With the help of a local guide, Biff not only discovers the truck, but uncovers a plot to overthrow the government.

A taut hostage drama in a remote seaside resort during the off season. A mobster turning witness against the syndicate is on the run and holds the Bakers and other guests hostage, knowing that among them is an assassin hired to kill him.