Great Britain has had an international agreement for the last 50 years with a small pacific island. It has been ignored until the death of their king brings it to the attention of the Foreign Office in Whitehall. They decide to send Cadogan de Vere Carlton-Browne to re-establish friendly relations.
When nuclear scientists are kidnapped and smuggled behind the Iron Curtain, an FBI man and a British agent are assigned to catch the kidnappers.
Young Anthony Pendrell plays the precocious son of Scotland Yard inspector Norman Shelley. Pendrell's efforts to emulate his father usually results in nothing but irritation for his elders. But when a boarding house becomes the headquarters for a criminal gang, it is Pendrell who cracks the case.