In Podkayne of Mars, we see Podkayne, her brother, and their uncle, Tom, kidnapped by a Mrs. Greer. What was the motive behind the kidnapping? Similarly, what was the idea behind smuggling a bomb onto the Tricorn, their spaceship? Does RAH make this clear in his book or perhaps in interviews?
(RAH vaguely mentions a political battle between those in the colonies who wanted to unify with Terra and those who didn't. Where do the above-mentioned terrorists fit in?)