Free Classic Audiobook Mystery: In The Mirror of the Magistrate

First up for tonight is your mystery audiobook.
For those of you who like your mysteries short, Panzer found a Father Brown mystery at the Bitesized Audio channel on YouTube.
 The Father Brown mystery In The Mirror of the Magistrate was written by G. K. Chesterton. It's narrated by Simon Stanhope and 51 minutes long.
 Make a cup of tea and see if you can solve the mystery before Father Brown does.
 To listen to the episode tootle over to Father Brown