The introduction of Flambeau (played by John Light) is the episode's greatest success. The verbal sparring between him and Father Brown reveals a mutual, albeit begrudging, respect.
“A nice little mystery and fitting end to a good first series.” IMDb "Father Brown" The Blue Cross (TV Episode 2013) - IMDb Father Brown 1x10
When Bishop Talbot warns of a threat against a priceless sapphire-studded cross, Father Brown decides to personally transport the relic by train to Newbury Abbey. This decision puts him at odds with Inspector Valentine, who views the move as reckless. On the train, Father Brown encounter a trio of suspicious passengers, including the disabled Mr. Dawson and Captain Flynn, as he attempts to smoke out the notorious thief Flambeau. Review & Reception The introduction of Flambeau (played by John Light)
The adaptation adds emotional weight by linking the characters' backstories to their shared history in the Great War. This decision puts him at odds with Inspector
Critics and viewers generally consider this a standout "10-star" episode that effectively uses its cramped train setting to build tension.
Fans of the original story will recognize the classic "parcel swap" Father Brown uses to outsmart Flambeau.