Biff Baker U.S.A.

Bill tries to help a young Polish boy get his mother's diamond ring back from a thief, uncovering crooks who prey on refugees in Marseilles.

Bill and Louise try to help an Air Force pilot whose plane crashed behind the Iron Curtain.

The Bakers are asked to import some paintings that they soon discover are actually disguised old masterpieces, looted from great museums by the Nazis.

While on holiday in the German Alps, Biff and Louise uncover a Nazi scheme to counterfeit American money, leading to a search for the plates used to print $20 bills.

The Scotland Yard seeks help from the Bakers in locating foreign agents in London.