After being serialized in "Cosmopolitan", Hobson's second novel, "Gentleman's Agreement", was published by Simon & Schuster on February 27, 1947. This story of a magazine writer who decides to research antisemitism by posing as a Jew was a worldwide success, translated into thirteen languages. On April 27, 1947, it reached number one on the "New York Times" best seller list, where it would remain for fourteen weeks. (According to Publishers Weekly, it was the third-best selling novel of 1947 at some two million copies.) The Jewish Book Council named "Gentleman's Agreement" the best Jewish novel of the year, but Hobson declined the award, which she later regretted.