Saul of Tarsus is one of the best known and most beloved figures of Christianity. This man, later known as St. Paul, set the tone for Christianity, including an emphasis on celibacy, the theory of divine grace and salvation, and the elimination of circumcision. It was Paul who wrote a large part of the New Testament, and who called it euangelion, "the gospel." There is another side of Paul, however, that has been little studied and that is his connection to the Roman military establishment and its intelligence arm. While other scholars and writers have suggested the idea that Paul was cooperating with the Romans, this is the first book-length study to document it in detail. By looking at the traditional story through a new lens, some of the thorniest questions and contradictions in Paul's life can be unravelled. How did he come to work for the Temple authorities who collaborated with the Romans? How was he able to escape from legal situations in which others would have been killed? Why