Click on a thumbnail to go to Google Books.
Podkayne of Mars (original 1963; edition 1995)
Podkayne of Mars by Robert A. Heinlein (1963)
While accompanying their uncle, a wily politician, on a trip from Mars to Earth, Podkayne and her brilliant but pesky younger brother are caught up in a plot to keep Uncle Tom from an important conference.
(summary from another edition)
Is this you?
Become a LibraryThing Author.