Based on the stories of G. K. Chesterton, Father Brown follows the crime-solving priest of St. Mary's Catholic Church in the fictional village of Kembleford in the early 1950s. The mild-mannered priest looks unremarkable, but his gentle nature and slightly crumpled look belie a razor-sharp wit and intellect. Father Brown is aided in his crime-solving activities by his parish secretary, Mrs. Bridgette McCarthy, who checks his facts and defends him from the frustration of his congregation and makes sure he eats.
When an ungodly man is murdered at the unveiling of a new church clock, Father Brown must find the killer before an innocent woman is sent to the gallows.
Soon after his poetry recital, Leonard Quinton is found hanging in the conservatory. When Father Brown realizes that he could not have committed suicide, the search begins for a murderer.
When Lady Felicia finds a stripped and injured man stuck up a tree, Sid is implicated as the perpetrator. Can Father Brown prove his innocence or has Sid gone too far this time?
When the Church of Apollo comes to Kembleford Susie is drawn to their charismatic leader, Kalon. After his wife is murdered, Father Brown must break his spell over Susie or risk losing her forever.
When two nuns die in mysterious circumstances at St Agnes convent, Father Brown investigates with the aid of Sister Boniface, an eager young fan of detective novels.
After a murder at the Kembleford charity treasure hunt, general suspicion falls upon a bereaved man who wants revenge. However, Father Brown is determined to prove that he's innocent.
When the Mayor drops dead during his speech at the Kembleford village fete, Father Brown deduces that he was deliberately electrocuted. Meanwhile Mrs. McCarthy's past comes back to haunt her.
When his priceless Blue Cross is targeted by the infamous criminal Flambeau, Father Brown takes the initiative to try and save his soul. But is he walking into a trap?
