At the annual village fete, the obnoxious mayor William Knight (Sam Crane) is electrocuted at the microphone. He is a man with many enemies, including his wife, (Louise Brealey), who is arrested. Father Brown is shocked by what is heard in the confessional, but it provides a clue about the killer. Mrs. McCarthy's 'long dead' husband, Franc (Frank Grimes), turns up dressed as a magician.
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?
Parishioner Charlotte McKinley asks Father Brown to exorcise her house, which she believes is haunted by her sister Elspeth, who disappeared nine years earlier. The priest suspects that somebody is playing an elaborate prank until Charlotte herself disappears from a locked room.
Ex-serviceman Felix Underwood (Peter Bramhill), a mental patient at the Danvers Retreat, dies suddenly in the street. Events take an unusual turn when he returns to life two days later at his church committal. Father Brown assists Inspector Sullivan to discover the reason for the resurrection, and gets himself committed for mental problems.
The opening to the public of Pryde Castle, an estate mired in death duties, ends when guide Audrey Diggle (Marcia Warren), is struck and killed by an arrow. She was an expert on the Pryde's family history, including an old curse. Father Brown is convinced that the motive lies in the Pryde family's past, when a page from the parish birth records goes missing. All the family members are known to use a longbow.
Violet Fernsley (Emma Stansfield), convicted of killing her pig farmer husband whose body has never been found, is given a temporary reprieve from the gallows when she claims she is pregnant. The pregnancy test gives Father Brown three days to find the real killer. When her husband's finger turns up in a pig's stomach, it points to a serial killer amongst the family.
The Lannington Rosary, missing for 500 years, is a relic blessed with healing powers. Professor Hilary Ambrose (James Laurenson) has sent an ancient prayer book containing a clue to its whereabouts to his old friend Father Brown, before he goes missing and his home is ransacked. Brown receives unexpected help from the untrustworthy Flambeau (John Light), returned from the dead. A terminally ill fellow priest, Father Ignatius (Anton Lesser) also seeks the rosary.
Father Brown is laid up in his attic bedroom with a broken leg, and young Father Roland Eager is acting as his locum. His film of African orphans being shown at the Kembleford Women's Institute is switched for a pornographic film. In the following days, two members of the Institute are murdered, one poisoned and one stabbed with a hat pin. Inspector Sullivan arrests Dianah Fortescue, whose husband was earlier arrested in a Soho pornographic cinema. Brown investigates with the help of Mrs. McCarthy, Lady Felicia, Sid Carter, and a telescope.
Alice Armstrong has been treated by electroshock therapy for memory loss and depression, after she accidentally killed her mother. When her father is murdered and a rope, gun, and knife are left behind, Magnus the chauffeur is suspected together with Peter, Armstrong's secretary, whom Alice loves. The truth of a father in debt leads Father Brown to another conclusion about the deaths.
Edward Gerard, a prisoner of war who returns from North Korea sympathetic to his captors greatly displeases his martinet uncle, Colonel Cecil Gerard (Nicholas Jones), who threatens to commit him to an asylum. When the Colonel is murdered, the suspects include the nephew, the Colonel's daughter (an adopted Chinese girl) the nephew was going to run away with, the brother-in-law, and the victim's wife. Father Brown finds the solution lies in the family history and the Colonel's sexual intentions to his adopted daughter.
A gruesome death on a local farm is blamed on the Kembleford physician through a series of poison pen letters. Father Brown must figure out who sent them in order to save his friend from the gallows.
A day out at a local hill climb track ends with one of the drivers killed in a car crash. When Father Brown will not stop investigating, an infuriated Sullivan resolves to put an end to his meddling for good.
Father Brown finds himself embroiled with MI5, which puts Lady Felicia in a compromising position. To protect secrets in her own past, will she betray her friend?
After Sir Raleigh's new bride insists on seeing his Egyptian mummy, her dead body is found in a locked room. Father Brown investigates - has Amenhotep risen from the dead?
The circus brings death to Kembleford when a clown is murdered. Father Brown must determine who the killer is and why a parishioner has agreed to marry the sinister wizard Welkin.
A murder at the local army barracks using a legendary broken sword leads Father Brown to investigate another death at Dunkirk some 13 years ago.
When Kembleford's new cricket captain is framed for murder, Father Brown must prove his innocence to give his team any chance of beating neighbouring village Hambleston.
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