Father Brown accidentally attends a séance at the house of Professor Robert Wiseman who is showcasing the power of a magical artifact - a bone whistle - which is on sale to the highest bidder.

The Kembleford Ramblers' annual outing takes a tragic turn when the local Lord is found strangled. In the name of community togetherness Inspector Mallory and Sergeant Goodfellow are joining some local ramblers.

Much to the disapproval of Mrs McCarthy, Father Brown attempts to support newly-single mother Nell Winford - but is unable to find her anywhere to stay.

Tensions rise to deadly levels when a performance troupe of anarchists arrive in Kembleford. An anarchist troupe are performing at Clegg Farm intent on starting a revolution. Mrs McCarthy is not impressed, but Bunty is inspired.

Suspicions are aroused when the holiest house in Kembleford is linked to the death of a wanton woman.

When a body is discovered in a vineyard, Father Brown must search for the murderer.

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 gets involved with MI5, which puts Lady Felicia in a compromising position.

When an ex-serviceman drops dead in the street, Father Brown investigates the facility where he was a patient. Could something sinister lie beneath the surface at Danvers Retreat?

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.