Fellowship of the Frog

Scotland Yard and an American amateur, Richard Gordon (Joachim Fuchsberger), are both after a master criminal called The Frog, who hides behind a bulging-eyed mask. His henchmen carry the same frog tattooed on their forearms. Harald Reinl follows the trail to a country manor, to the steely-eyed man who owns it and the daughter two men have noticed, and the mask stares back from the dark.