This is one of Heinlein's 'juvenile' science fiction novels. It starts as a light read about a young woman coming of age on a space ship traveling between Mars and Venus. By the end it turns into a serious adventure, becoming more dark and involved.
This is one of R.A.H.'s best novels, and holds it's own against his more famous works such as Stranger in a Strange Land or Starship Troopers.
