How did charlie make sure the third level actually exist?
Solution :-
Charlie's psychiatrist, Sam, disappeared suddenly. However, one day, Charlie found an envelope addressed to Sam in his stamp collection. The envelope was addressed to Charley's grandfather and was sent to him at his Galesburg address. The date on the envelope was 18 July 1894. In the letter, Sam mentioned that the third level truly exists, and he had used it to escape to Galesburg.
Charlie's psychiatrist, Sam, disappeared suddenly. However, one day, Charlie found an envelope addressed to Sam in his stamp collection. The envelope was addressed to Charley's grandfather and was sent to him at his Galesburg address. The date on the envelope was 18 July 1894. In the letter, Sam mentioned that the third level truly exists, and he had used it to escape to Galesburg.