Only on the “CBS This Morning” podcast, journalist and author Liza Mundy discuss her new book, "Code Girls: The Untold Story of the American Code Breakers of World War II" with CBS News correspondent Vladimir Dutheirs. They discuss how the women, who were forbidden to talk about their service, were essential to the United States and the Allies winning the war. Mundy also announces that the book has been optioned for a movie.