The complete audiobook is available for purchase at Audible.com:
voicesoftoday.net/fbgc

The Secret of Father Brown
By G. K. Chesterton

Narrated by Graham Scott

While visiting his old friend Flambeau, Father Brown attempts to explain to an inquisitive American the 'secret' of his detective method, by means of eight stories of crime, murder, and obsession, including: a poet accused of the murder of a magistrate; stolen jewels and stolen fish; a theatre manager dead in a locked room; a mourner shut away in a castle; and the case of the worst crime in the world...