AllMovie

In Scandinavia to receive a prize for his scientific research, Peter Brady discovers that the ceremony's guest of honor, Eastern Bloc author Tania Raskoff (played by future film director Mai Zetterling), has been arrested by minions of her government. Inasmuch as he has the power of invisibility, Brady encounters little difficulty in locating Tania's hiding place. But rescuing her is another matter entirely--especially since the hideway is surrounded by a mine field.