Once President Harry S. Truman appointed Washington hostess Perle Mesta as Ambassador to Luxembourg, the foundation was laid for a musical comedy that would kid politics-foreign and domestic alike. Ambassador Sally Adams, with slim credentials, is sent off to administer in the tiny duchy of Lichtenburg. It's not long before her down-to-earth, typically undiplomatic manner has surprised and charmed the local gentry, especially the handsome Prime Minister. A second romance is blossoming between her young Ivy League aid and Lichtenburg's enchanting young Princess. The course of love is threatened by the stuffy opposition, who eventually succeed in wrangling Sally's recall, but not before all has resolved happily for both pairs of lovers.