Soon after his poetry recital, Leonard Quinton is found hanging in the conservatory. When Father Brown realises 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?

Father Brown joins the search when a girl who is believed to be radioactive goes missing overnight. But just who is responsible for her disappearance?

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.

Father Brown investigates the mysterious death of a beekeeper.

Father Brown joins forces with Chief Inspector Valentine to uncover a dark secret at Helmsley House.