John Drayton's meeting with the lovely Austrian girl Anna Frandl turns his leisurely Swedish holiday into a life and death affair. Anna and Carl Frandl are obviously on the run - but from whom or what? They are clearly brother and sister - or are they? Drayton's curiosity is aroused, but he soon discovers that it can be curiosity that kills. His attempt to help them leads him through the mysterious country of Lapland. It is natural territory for a sinister pursuer whose implacable determination to hunt them down makes him seem like a fiend incarnate - the Devil himself!