An accessible story of a lesser known aspect of World War II. A Norwegian boy finds himself serving as a messenger, then spy for the resistance movement as his his country struggles under Nazi occupation. When he is ultimately found out, he makes a harrowing escape to Sweden. Shadow Mountain is an easy read, and offers insight into a culture of teenagers grappling with the difficulties brought on by the challenges of occupation. Based on a true story, the book could serve as a gateway to other books of WWII for middle grade or early YA readers.