Between Planets
A young man travels from an uuper class dude ranch school to join his family on Venus from Earth.  He is evidently unbeknownsth to himself a courier of secret information vital to the out come of an impending interplanetary war.  As the story continues, his ability to communicate with the Venerians and his involvement with the guerilla forces lead to a suitable outcome.  I read this book the first time over 50 yrs ago, and have reread  it several times...
Science fiction, Venus (Planet), Fiction, Space warfare, Fiction, fantasy, general
Robert A. Heinlein
Robert Anson Heinlein was an American science fiction writer. Often called "the dean of science fiction writers", he was one of the most popular, influential, and controversial authors of the genre. He set a high standard for science and engineering plausibility and helped to raise the genre's standards of literary quality. He was one of the first writers to break into mainstream, general magazines such as The Saturday Evening Post, in the late 1940s, with unvarnished science fiction. He was among the first authors of bestselling, novel-length science fiction in the modern, mass-market era. For many years, Heinlein, Isaac Asimov, and Arthur C. Clarke were known as the "Big Three" of science fiction. ([Source](http://en.wikipedia.org/wiki/Robert_A._Heinlein).)