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In page North by Northwest:

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Guernsey admitted that his treatment was full of "corn" and "lacking logic", and he urged Hitchcock to do what he liked with the story. Hitchcock bought the 60 pages for $10,000.[citation needed] In an interview in the book Screenwriters on Screenwriting (1995), Lehman stated that he had already written much of the screenplay before coming up with critical elements of the climax. An example of the "corn" in the finished screenplay was the scene where Roger Thornhill returns to the Townsend estate with the detectives to find everything changed. If Thornhill was indeed a spy, he would have had no reason to return to the estate after his escape the previous night, nor would the criminals be expecting him to return as they obviously did.