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...