The film is shown as a series of memory flashbacks during a formal ceremony where the protagonist is instituted as a cardinal.
A newly ordained Irish Catholicpriest, Stephen Fermoyle (Tom Tryon), returns home to Boston in 1917. He discovers that his parents are upset about daughter Mona (Carol Lynley) having become engaged to marry a Jewish man, Benny Rampell (John Saxon). Stephen and his Irish Catholic family will only permit Mona to marry Benny if he becomes a Catholic or agrees to raise any children as Catholic, as demanded by the papal bullNe Temere (superseded in 1970). Benny does not agree and leaves to serve in World War I. Mona seeks Stephen's counsel as a priest. After he tells her to give Benny up, she runs away and becomes promiscuous.
Concerned about the young priest's ambition, the archbishop (John Huston) assigns Stephen to an out-of-the-way parish where it is hoped that he will learn humility. There he meets the humble pastor, Father Ned Halley (Burgess Meredith), and Fermoyle observes the unpretentious way in which he lives his life and treats his parishioners. Father Halley is very sick with multiple sclerosis. Fermoyle learns humility from him and his housekeeper, Lalage (Jill Haworth).
Meanwhile, Mona becomes pregnant out of wedlock. Stephen, his brother and Benny find Mona in agony because her pelvis is too small for a large baby. She is taken to the hospital, where the doctor tells Stephen that it is too late to perform a caesarean section and in order to save Mona, the head of the baby must be crushed. Stephen will not allow the doctor to do so, because according to Catholic doctrine, the baby may not be killed. Mona dies giving birth to the child, Regina.
Racked with guilt over the death of his sister, Stephen suffers a crisis of faith, so he is transferred to Europe and made a monsignor, but he is unsure of how committed he is to a life in the clergy, and he travels to Vienna, taking a two-year sabbatical by working as a lecturer. There he meets and enters into a relationship with a young woman, Annemarie (Romy Schneider). Stephen does not violate his vows.
Stephen's vocation calls him back to Rome and the church. The Vatican returns him to the United States on a mission in the American South to assist a black priest named Father Gillis (Ossie Davis) who is opposed by the Ku Klux Klan. After successfully handling the assignment, Stephen is consecrated as a bishop, with Father Gillis present for the consecration.
Stephen is sent back to Austria to persuade a cardinal not to cooperate with the Nazi government, with a threat of a world war looming over all. He and the cardinal ultimately must flee for their lives. He manages to see Annemarie one last time after she has been imprisoned by the Nazi authorities. After the success of the missions on which the Vatican had sent him, he is elevated to the College of Cardinals.
On the eve of World War II, a ceremony is held in which Stephen formally becomes a cardinal. He warns about the dangers of totalitarianism and pledges to dedicate the rest of his life to his work.
The script was credited to Robert Dozier, but featured uncredited contributions by Ring Lardner Jr. who worked with Preminger in developing characterizations and story structure.[4]Saul Bass was not only responsible for designing the film's poster and advertising campaign, but also the film titles, during which Bass transforms a walk through the Vatican into an abstract play of horizontal and vertical lines.[5]
^Marina Pavido (December 1, 2020). "Wolf Albach-Retty – A Famous Father". Cinema Austriaco. Retrieved July 15, 2023; the actor Albach-Retty was Romy Schneider's father, and this was their only film together.