How to watch Sister Boniface Mysteries Season 4 in the UK

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.

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. Episodes will be released weekly every Tuesday through October 7, 2025.

Where to Watch Sister Boniface Mysteries Season 4 in the UK

The first three seasons of Sister Boniface Mysteries are available to stream for free on U (formerly known as UKTV) in the UK. Season 4 is expected to become available on the same platform after it completes its run in the US on BritBox.

Sister Boniface Mysteries Season 4 Full Episodes

Season 4 contains 8 episodes (8 x 60′), premiering weekly. Here are the all episodes:

1. 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.
2. Episode 2 – A Murder of Crows (Premiere date: August 26, 2025)
   A killer scarecrow wreaks havoc at Great Slaughter’s annual Scarecrow Festival.
3. 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.
4. Episode 4 (Premiere date: September 9, 2025)
   Details to be announced.
5. Episode 5 (Premiere date: September 16, 2025)
6. Episode 6 (September 23, 2025)
7. Episode 7 (Premiere date: September 30, 2025)
8. 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

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.

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:

Sister Boniface, Season 4 News https://t.co/2DtEVHW4g9 @BritBox_US pic.twitter.com/FGEpfeO5MA

— Janet Rudolph (@JanetRudolph) August 18, 2025

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