Thornhill and The Professor are discussing what Vandamm is exporting.
“Government secrets, perhaps?” says The Professor.
“Then why don’t you grab him?” asks Thornhill.
“Still too much we don’t know about his organization,” says The Professor.
“Oh, I see,” says Roger. “What’s all this got to do with Mount Rushmore?”
“Well, Vandamm has a place near there,” says The Professor. “We think it’s his jumping-off point to leave the country tomorrow night.”
“Hmm,” says Roger. “You’re going to stop him?”
“No,” says The Professor.
“Well, then what are we going there for?”asks Roger.
“To set his mind at ease about George Kaplan,” says The Professor.
“Oh, you, huh?” says Roger. “Hmm. Why, you’re George Kaplan, aren’t you!”
“Oh no, Mister Thornhill,” says The Professor. “There is no such person as George Kaplan.”
“What do you mean there’s no such person?” asks Roger. “I’ve been in his hotel room! I’ve tried on his clothes. He’s got short sleeves and dandruff!”
“Believe me, Mister Thornhill,” says The Professor, “he doesn’t exist. Which is why I’m going to have to ask you to go on being him for the next twenty-four hours.”
“What?” says Thornhill.
“Come on,” says The Professor, “we’ll discuss it on the plane. “
Roger starts to object, but the conversation is drowned out by the noise of the engines of the Northwest Lockheed L-749A Constellation.