There are many who are intrigued by the institution of the Holy See under the pontificate of Pope Francis. The Vatican Code opens a curtain to the Holy See from a unique angle. It browses some of the highlights of the papacy from 2013 to 2017 as well as some of its murkier elements. It profiles some of the personalities and the daily and long-term innerworkings of the United States Embassy with the Vatican. The Vatican Code provides key insights into the sensitive negotiations of an American ambassador to the Holy See and will help readers understand the intricacies of this unique role.