Mike Smith
Here’s everything you need to know about Sister Boniface Mysteries Season 4, including its premiere date, full cast, episode guide, and where to watch.
How to watch Sister Boniface Mysteries Season 4 outside the US on BritBox
To watch Sister Boniface Mysteries Season 4 outside the US, use a reliable VPN and connect to a US server. Once connected, visit BritBox directly or through the BritBox Prime Video Channel or BritBox Apple TV Channel. Then log in or sign up for a new account to start streaming all episodes.
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- Install the VPN app on your device.
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- Watch Sister Boniface Mysteries Season 4 full episodes online
Sister Boniface Mysteries Season 4 (2025) Synopsis
First there was Father Brown. Now, say hello to Sister Boniface. This clever, moped-riding nun is the police’s secret weapon for solving murders in this divine spin-off set in the 1960s. Combining cozy British mystery charm with forensic science, Sister Boniface Mysteries has become one of BritBox’s most beloved originals.
Sister Boniface Mysteries Season 4 Synopsis
The new season continues to follow Sister Boniface (Lorna Watson), the Vespa-riding Catholic nun with a forensic crime lab, as she aids the local constabulary in the fictional village of Great Slaughter. Season 4 brings a fresh mix of quirky crimes and charming period drama—from a sabotaged TV stunt and a killer scarecrow to shocking twists at local fêtes and weddings.
With her faith, wit, and science-based approach, Sister Boniface once again proves herself invaluable in solving even the most puzzling murders.
When Does Sister Boniface Mysteries Season 4 Premiere?
Sister Boniface Mysteries Season 4 premieres on Tuesday, August 19, 2025, on BritBox in North America. Episodes will be released weekly every Tuesday through October 7, 2025.
Where to Watch Sister Boniface Mysteries Season 4 in the US
You can watch Sister Boniface Mysteries Season 4 exclusively on BritBox, with new episodes available every week starting August 19, 2025. The series can also be streamed through the BritBox Channel on Prime Video or the BritBox Apple TV Channel for added convenience.
Where to Watch Sister Boniface Mysteries Season 4 in Canada
You can stream Sister Boniface Mysteries Season 4 on BritBox Canada, with episodes released weekly on the same schedule as the US. Canadian viewers can also access the series via the BritBox Channel on Prime Video or the BritBox Apple TV Channel.
Sister Boniface Mysteries Season 4 Full Episodes
Season 4 contains 8 episodes (8 x 60′), premiering weekly. Here are the all episodes:
- Episode 1 – Biff! Pow! Zap! (Premiere date: August 19, 2025)
Sister Boniface investigates a sabotaged stunt when the lead actress in TV show Foxman plummets to her death. - Episode 2 – A Murder of Crows (Premiere date: August 26, 2025)
A killer scarecrow wreaks havoc at Great Slaughter’s annual Scarecrow Festival. - Episode 3 – Are Ye’ Dancin’? (Premiere date: September 2, 2025)
When a ceilidh band member is killed, Sister Boniface must find the culprit at Mrs. Clam’s birthday party. - Episode 4 (Premiere date: September 9, 2025)
Details to be announced. - Episode 5 (Premiere date: September 16, 2025)
- Episode 6 (September 23, 2025)
- Episode 7 (Premiere date: September 30, 2025)
- Episode 8 (Season Finale) (Premiere date: October 7, 2025)
Sister Boniface Mysteries Season 4 Cast
Here are the list:
- Lorna Watson as Sister Boniface
- Max Brown as DI Sam Gillespie
- Jerry Iwu as DS Felix Livingstone
- Ami Metcalf as WPC Peggy Button
- Carolyn Pickles as Reverend Mother Adrian
Guest Stars for Season 4
- Les Dennis
- Katherine Kingsley
- Martyn Ellis
- Mina Anwar
- Ed Birch
- Daniel Laurie
Can You Watch Sister Boniface Mysteries Season 4 Online for Free?
You can watch Sister Boniface Mysteries Season 4 online with a 7-day free trial on BritBox. The free trial is also available through the BritBox Channel on Prime Video and the BritBox Apple TV Channel. After the trial period, a subscription is required to keep streaming.
Is Sister Boniface Mysteries Suitable for All Ages?
Yes. Sister Boniface Mysteries is rated TV-PG. While it involves murder mysteries, the tone is cozy, light, and suitable for teens and older viewers. It avoids graphic violence, making it a safe choice for family viewing compared to darker crime dramas.
Where Can I Download Sister Boniface Mysteries Season 4 Episodes?
You can download episodes for offline viewing through the BritBox app (available on iOS, Android, Fire TV, Roku, and Apple TV). Downloads remain available as long as your subscription is active.
FAQs
1. How many episodes are in Sister Boniface Mysteries Season 4?
There are 8 episodes, premiering weekly from August 19 to October 7, 2025.
2. Do I need to watch Father Brown before Sister Boniface Mysteries?
No. While Sister Boniface first appeared in Father Brown, this spin-off stands on its own.
3. Who gets married in Season 4?
Detective Sergeant Felix Livingstone’s wedding plays a central role in one episode, with Sister Boniface once again uncovering dark secrets along the way.
4. Is Sister Boniface Catholic or Anglican?
Sister Boniface is a Catholic nun from St. Vincent’s Convent, blending faith and forensic science in her work.
5. Can I watch Sister Boniface Mysteries on Netflix or Hulu?
No. Sister Boniface Mysteries is exclusive to BritBox.
Sister Boniface Mysteries Season 4 Trailer
Here’s the trailer for the new season of Sister Boniface Mysteries series:
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