Hilton became a success writer when he was still young. He published his first novel, "Catherine Herself," when he was 20 years old. Several of his books were international bestsellers. Some successful films were made based on his novels. Three of the best known movies are: "Lost Horizon" (1933), "Goodbye, Mr. Chips" (1934), and "Random Harvest" (1941). Many copies of "Lost Horizon" were sold in the 1930s as one of the first Pocket Books. The serial number was "1". Some people call it the novel that began the popularity of paperback books.