WriterJude Tindall
DirectorIan Barber
Research stateCase file + location evidence
Spoiler-light premise
Two cyanide deaths at a convent force Father Brown to investigate a closed religious community with dangerous secrets.
What to watch for
The first appearance of Sister Boniface, later the lead of her own spin-off mystery series.
Continuity tags
Conservative catalogue links for recurring stories—not a complete cast list.
Location evidence
This case carries explicit location links in the research catalogue.
- Princethorpe College
Episode order and contributor credits: source record ↗