When their Handley Page Hampden bomber was shot down, Pilot Officer Drew Grange and Sergeant Adam Weir were stranded on the icy border between Norway and Russia.

Helped by a couple of civilian hunters, the R.A.F. men were soon embroiled in a fight for survival. Finding an unarmed, abandoned Tiger Moth skiplane, they took to the skies above the remote, frozen frontier in a desperate attempt to get warn their allies of an imminent Nazi threat.