Podkayne of Mars

This is one of Heinlein's juveniles, but not one of the best ones. The protagonist is a teenage girl who along with her younger brother goes on a trip with her Uncle that takes them from Mars to Venus. While the trip is meant to go to Earth, we don't really see that part because the action is all on the spaceship and on Venus. Podkayne is not overly bright, and to me a not very likeable character. Her brother is smarter, but not overly likeable either. Podkayne is somewhat inquisitive, and gets pulled into an interplanetary plot aimed at her Uncle, who is using their presence to disguise a political trip. Podkayne gets caught by his enemies, is endangered, but in the original manages to survive mostly because the publisher insisted. Since then, the book has been restored to Heinlein's original ending, which has her killed. I cannot imagine why the publisher had a problem with book aimed at juveniles where the protagonist gets killed, mostly as a result of her stupidity. Personally, I tend to the view that I don't expect teenagers to exhibit great wisdom and responsibility.