April 1940. Nazi Germany has invaded neutral Norway. Fleeing north are three officers of the King's Guard - men who have been entrusted by the Norwegian King to get leading scientist Hening Sandvold out of Oslo to safety. As Sergeant Jack Tanner and his comrades are pushed back from Lillehammer, they are stranded in the mountains, where they stumble across Sandvold and his protectors, and then a French patrol of alpine troops. Sandvold holds the key to a secret that could change the outcome of the entire war - but the odds are stacked against this ragtag group of soldiers and civilians making it to safety.