Case 55 · Series 5, episode 10
The Alchemist's Secret
First broadcast 12 January 2017. Plot solution deliberately omitted.
WriterRob Kinsman
DirectorSimon Gibney
Research stateExpanded case file
Broadcast positionCase 55 of 140
Spoiler-light premise
A professor suffering memory loss asks Father Brown to solve a centuries-old riddle, then becomes the suspect when a student is killed.
What to watch for
The search for an alchemical formula uncovers the reason an entire village vanished from the map.
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