Possible Clues:

• Turning briefly, managed to reverse — who's to tell?
• The teller returns there to decay in Scotland
• Voice-over person
• Teller and Oppenheimer disheartened after leaders of nuclear authority reveal traitor
• It makes Art roar out after bank's No 3 teller
• Voice over bookbinder perhaps
• He or she tells the story
• Movie voice
• The person telling the tale
• Storyteller in Scottish island going over peak