In a shadowy Catholic confessional, an anonymous man confides in Father James, portrayed by Brendan Gleeson, revealing the horrifying sexual abuse he suffered as a child at the hands of a priest. This man vows to kill James at the beach the following Sunday, stating that, although their abuser is deceased, the indifferent response from the Catholic community will propel his decision to murder an innocent priest to incite outrage. Father James, being a righteous man whose demise would reverberate more significantly through the church than that of an abusive priest, finds himself with merely a week to settle his affairs.
Empowered with the decision to notify the police resting squarely on his shoulders, James grapples with the ethical implications of breaking the seal of confession, especially since no forgiveness was sought for the impending sin. Compounding his struggles, his daughter Fiona, played by Kelly Reilly, has recently attempted suicide, feeling neglected after both her mother's death and her father's choice to enter the priesthood. As he performs his pastoral duties, James faces hostility from many members of the community.
Among the local residents, the butcher Jack Brennan, portrayed by Chris O'Dowd, is a source of confrontation after hitting his unfaithful wife, Veronica. When James confronts Jack, he hears Jack's unfounded accusations against Veronica's African lover, Simon. Simon, played by Isaach De Bankole, refuses to talk, alluding to violent memories from his homeland. James wrestles with the challenge of addressing Simon's actions and seeks solace and guidance from Father Leary, who suggests ignoring the matter entirely, given the potential for accusations of racism.
Continuing with his parish duties, James becomes involved in the life of an elderly American writer, Gerald, who grapples with suicidal thoughts. In a shocking twist, James borrows an antique revolver linked to The Troubles from Inspector Stanton, which brings an unsettling tangibility to his situation. Stanton reveals his own conflicted history involving a priest accused of rape, adding layers to the pervasive themes of sin and guilt coursing through this tale.
As Father James navigates through turbulent interactions with people such as millionaire Michael Fitzgerald, who offends him by showing blatant disrespect through vandalism of a rare painting, and a grieving widow named Teresa, portrayed by Marie-Josée Croze, who finds solace in James's comforting words, he faces a pivotal moment in reflecting upon guilt, virtue, and the fragility of human life.
One night, tragedy strikes when James witnesses the burning of his church, an act that compels him to examine his connection to community grievances. In the wake of these events, James confronts Fiona about feeling abandoned, and later expresses his commitment to not forsake Veronica spiritually. This turmoil rises further when James finds his beloved dog deceased, prompting a sorrowful burial while hiding the incident from Fiona.
As the fateful Sunday approaches, James engages in a series of meaningful interactions, including a heartwarming conversation with Gerald, learning to appreciate the duality of sin and virtue, ultimately resulting in mutual forgiveness with his daughter over the phone. After discarding his revolver into the sea, fate leads him back to the beach where Jack, consumed by fury and resentment, approaches him with a gun.
In a stirring final confrontation, Jack accuses James of indifference regarding the trauma suffered by children at the hands of priests. Their exchange leads to a tragic moment that culminates in violence as Jack shoots James.
In poignant vignettes, the community continues its daily rhythms while Fiona confronts Jack in prison, both grasping the telephone as they attempt to connect across the glass barrier, symbolizing the myriad threads of trauma, loss, and the quest for understanding that linger long after the events of that fateful beach encounter.
