The infamous MacGuffin in this Hitchcock film is the identity of the thief.The stylish film""s screenplay, by John Michael Hayes (in his second project with Hitchcock), was based on the novel of he same name by David Dodge.Harry was privately summoned by Dumbledore to his chambers, to show him a large glass case of vials, one of which contained the Headmaster""s memories regarding Tom Riddle, now known as "the most dangerous dark wizard of all time" - Voldemort.You gotta get out now, away from me...You get low, you stay low.No more friends.Nothing familiar.There""s enough in there for you to make a life.Any life...I""ll end it.Go ahead." He used the Professor""s phone to speak to Conklin, falsely reported that Marie was dead, and then proposed a meeting with Conklin in Paris at 5:30 pm that day, in the middle of a bridge named Pont Neuf.Thornhill and the man circle around he room eyeing each other, until the man observes: "Not what I expected.