Podkayne is a girl from Mars in her late teens. Mars is a bit of a frontier planet, and she has dreams of venturing further afield. Together with her younger brother Clark, she goes along with her uncle, a powerful Senator, on a journey towards Venus and Luna aboard the luxurious liner Tricorn. Intrigue awaits.
Published in 1962, there is some debate on whether this novel should be considered one of the Heinlein Juveniles or not. I would say it is somewhere in transition territory, still passable as Young Adult fiction but definitely starting to explore more adult themes than its predecessors. The publishers were apparently not entirely pleased by this, and Heinlein even had to rewrite the ending before publication to make it less dark, though many current editions include the original ending as well.
The story is told from Poddy’s perspective. She has ambitions to break into the male dominated industry of spaceship flight crews. She wants to be treated as an equal in those respects, but she is certainly aware of how to make men do her bidding through manipulations. The sexual dynamics are rather dated, even though Heinlein was a progressive thinker on the subject in his day. The story is somewhat banal, but Poddy’s sassy and irreverent narration saves it from being boring. The setting also cleverly avoids most things that would date it, ensuring it does not age as badly as most SF of the time. The one thing that cannot be avoided is the view that Mars and Venus would be in any way inhabitable by humans, views that were refuted completely in the years following publication. However I was happy to squint at those details, treating Mars and Venus as “the way they should have been” in more innocent Universe.