Sinner

The novel follows Sean Bell, a wealthy, morally unscrupulous investment broker in Kansas City who believes in nothing but money, sex, and scotch. Sean's cynicism traces back to a family tragedy: His younger sister, Lizzy, was sexually abused by a Catholic priest and killed herself at 19. Her death shattered Sean's faith and severed the decades-long bond between his family and the Iversons, their closest friends. Sean now serves as the de facto caretaker for his family, especially his mother, Carolyn, who has cancer.

On the night Sean closes the Keegan deal, a lucrative property transfer for his firm, Valdman and Associates, he attends a hospital benefit and meets a captivating woman in a red silk dress who calls herself Mary. They share an intense connection, and Sean feels an unfamiliar, almost spiritual pull toward her. Before he can kiss her, his father calls: Carolyn is in the emergency room. Sean leaves Mary behind, certain he will never see her again.

The next morning, Sean's boss, Harry Valdman, reveals that the buildings Sean brokered for demolition house a shelter run by the Servants of the Good Shepherd, a Catholic order of sisters who also shelter survivors of human trafficking. The story has leaked to the press, and Valdman orders Sean to work with the sisters' representative: a postulant, or candidate for the order, named Zenobia Iverson, the younger sister of Sean's best friend, Elijah Iverson.

At the shelter, the woman who appears is Mary from the gala. Sean slowly realizes she is also Zenny Iverson, whom he has not seen in 14 years. Zenny knows who Sean is the entire time but wants one last night of freedom before entering the novitiate, the period of training before taking religious vows. Tension escalates until they kiss in the shelter kitchen. Horrified, Sean flees. He calls Elijah, who, unaware of the kiss, makes Sean promise to keep Zenny safe. Sean then asks Valdman to reassign someone else, but the assignment goes to Charles Northcutt, Sean's predatory office rival. Sean realizes he has handed Zenny to the worst possible person.

Days later, Zenny arrives at Sean's penthouse and asks him to have sex with her for the month before she takes her vows. Her novice mistress, the nun who supervises her training, and the Reverend Mother, the head of the order, believe she should confront what she is giving up. In a voice message, Zenny reveals a deeper fear: She has been pursuing religious life not to follow God's call but to defy her parents, who planned every aspect of her future. She wants Sean to help test whether her commitment is real. Sean calls his brother Tyler, a former priest, who urges him not to project his trauma onto Zenny: "Don't make Zenny part of your story with Lizzy, okay? It's not fair to her and it's actually not fair to you either" (102).

Sean agrees. Over dinner, they negotiate terms: Sean stipulates that Zenny cannot make him climax, so there is no ambiguity that he is acting for her benefit, and both agree the Keegan deal stays separate. He insists on taking his time and asks Zenny to move into his penthouse for the month. Their emotional intimacy deepens alongside the physical. Zenny describes the mission trip to Haiti that inspired her to pursue nurse-midwifery and her plan to open a birthing center for underserved women. Sean begins to feel that her life of purpose eclipses his pursuit of money.

Zenny also reshapes Sean's relationship with faith. When Sean discovers his mother has returned to praying the Rosary, Carolyn tells him that being furious with God is not the same as wanting God gone. Zenny introduces the Latin phrase credo ut intelligam, explaining that credo derives from cor dare, meaning "to give one's heart." The phrase signifies not blind assent but committed engagement: understanding through practice rather than prior certainty.

On the night of a charity fundraiser, Sean and Zenny have intercourse for the first time, and he recognizes that he is in love. At the event, a white woman mistakes Zenny for a server, and Zenny explains that any scene Sean causes will reflect back on her rather than the offender. Meanwhile, Sean secures a new shelter property and convinces Valdman to remove Northcutt from the deal. The Reverend Mother, aware of their relationship, commands Sean to tell Zenny he loves her.

Sean postpones the confession as Carolyn's health deteriorates. A new bowel obstruction leads to aspiration pneumonia, and Carolyn is moved to the intensive care unit (ICU). After an intimate encounter at the shelter, Sean blurts out that he loves Zenny. She reacts with horror, accusing him of confusing sex with love and wanting to control her life, just as her parents always tried to do. Sean argues that she is pursuing the convent to prove doubters wrong rather than out of genuine calling. Zenny declares the arrangement a mistake and leaves. Sean does not tell her his mother is dying.

At his brother Aiden's farmhouse, Sean discovers Aiden has been secretly dating Elijah. Sean accepts Aiden's bisexuality without reservation; Elijah, however, refuses to forgive Sean for sleeping with Zenny. Carolyn's pneumonia overwhelms both lungs, and her living will includes a do-not-intubate directive. She confirms she wants her breathing mask removed. Valdman demands Sean choose between his dying mother and his job; Sean refuses and is fired. Dr. Iverson, Elijah and Zenny's father, visits Carolyn, and he and Sean reconcile over the 14-year family schism.

Sean texts Zenny, admitting he misses her. When the mask is removed, Carolyn asks her sons to pray. Sean leads the Hail Mary and experiences a spiritual breakthrough, understanding that prayer is the act of committing and engaging rather than requesting answers. Zenny arrives, and Carolyn whispers something private to her. Tyler arrives in time to say goodbye. Carolyn dies peacefully, and Sean feels a transcendent contact with God, a "blinding, breathless, reckless moment" (327).

During her pre-vow retreat, Zenny leaves Sean a voice message confessing she loves him but still intends to take her vows. Sean goes to the monastery on the day of her investiture, the ceremony formally admitting her into the order, intending only to say goodbye. He finds her crying in a wedding dress and tells her he loves her but cannot watch her pledge herself to God. Zenny confesses she was about to take vows for the wrong reasons. They make love one final time, and Sean leaves, intending to let her go. The Reverend Mother calls and tells him to slow down. Zenny runs out of the monastery in her wedding dress and tells him that Carolyn's final words to her were "Don't lose your joy." At the altar, Zenny realizes the joy was not there but with Sean. She has not abandoned God, but she was committing for the wrong reasons, and Sean has shown her the difference. He catches her in his arms, and she chooses him.

One year later, Sean and Zenny are married and expecting a child. Sean runs a nonprofit funding Kansas City charities, including the Good Shepherd shelter. Zenny is halfway through her nurse-midwifery degree and still plans to anchor the shelter's birthing center. The novel closes with Sean's adaptation of the Hail Mary, ending with the prayer from its opening: "Pray for us sinners. Amen" (356).