After the body of the brother of the village vicar is found near the church tower, the local blacksmith becomes the first suspect, only for his wife to confess that she did it.
As the body of a drowned alcoholic woman is located near her home, the police believe it is an accident while Father Brown thinks otherwise.
A poet working at a conservatory commits suicide. Father Brown believes he hasn't killed himself, but rather has been killed.
In her park, Lady Felicia stumbles upon a man who has fallen from a passing train into a nearby bridge. Sid is accused of being behind attacking and robbing the man.
Susie falls under the influence of a cult's charismatic leader, and his wife dies in a suspicious accident.
After the suspicious death of two nuns, Father Brown investigates at the convent, where he's assisted by a young nun.
When a girl infected with a skin disease goes missing under mysterious circumstances, Father Brown steps in to uncover her whereabouts.
A series of mysterious murders take place after Lady Margaret runs Daniel Walsh's father, and Father Brown tries to find clues in order to solve the crimes.
After mayor William Knight is electrocuted during the Kembleford's annual village fête, his wife is charged with his murder, while Father Brown tries to uncover the truth.
Father Brown faces a challenging task, after he unwittingly causes a pricelss relic to be stolen, so he joins forces with the famous thief Hercule Flambeau in an attempt to recover it.