“36 Hours” (1965) Starring James Garner, Eva Marie Saint, Rod Taylor, Werner Peters, John Banner, Alan Napier. Written by George Seaton, based on the story “Beware of the Dogs” by Roald Dahl and a story by Carl K. Hittleman & Luis H. Vance. Directed by George Seaton. High level intrigue World War 2 style, following an elaborate deception by German psychiatric experts to extract top secret information about the impending D-Day invasion from Allied insider without him knowing about it; this is a radical expansion of the famous 1944 short story “Beware of the Dog” by Roald Dahl, with its more streamlined scenario of a downed, wounded RAF pilot substituted by the more grandiose vision of the “one man who holds the key to the war” formula. James Garner portrays Major Jefferson Pike, a U.S. Army Intelligence Officer who, after being briefed on the particulars of the imminent European Invasion, travels to Lisbon to meet with a recruited German double agent to ensure the Germans are anticipating the upcoming battle plans incorrectly.
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CHANDLER SWAIN REVIEWS 
My Doctor is now writing a paper on ‘Scroll wheel finger’. I think he intends to specialise.
I have never seen this. But given your review, and that Rod Taylor is in it, I doubt I will bother.
Best wishes, Pete.