Sister Boniface Mysteries Sets Season 4 Premiere Date —Here’s When the Quirky Detective Is Back on the Case

Sister Boniface Mysteries is back with season 4, and the timing is peak comfort TV: cozy murder puzzles, a nun who knows her way around a microscope and a wine press, and a village that cannot catch a break. If you are in the UK, set a reminder for Friday 26 September at 9pm on U&Drama. If you are in the US, episodes have already started rolling out on BritBox.

Where and when

The Father Brown spin-off returns to the UK on U&Drama at 9pm, Friday 26 September. Across the pond, BritBox users are already a step ahead with new episodes appearing now. So yes, depending on where you live, spoilers may start floating around sooner rather than later.

Who is back (and who is dropping by)

• Returning cast: Lorna Watson (Sister Boniface), Max Brown as DI Sam Gillespie, Jerry Iwu as DS Felix Livingstone, and Ami Metcalf as WPC Peggy Button.
• Guest stars: Les Dennis (Coronation Street), Katherine Kingsley (The Larkins), Martyn Ellis (Renegade Nell), Mina Anwar (The Sarah Jane Adventures), Ed Birch (The Witcher), and Daniel Laurie (Call the Midwife).

What season 4 is actually doing

In short: more chaos in Great Slaughter. The new cases include a bucking bronco going rogue on a game show set, a killer scarecrow on the loose (yes, a killer scarecrow), and an invasion that is, apparently, Scottish. There is also a stunt gone wrong that sends a femme fatale plummeting, plus the dreaded workplace exercise: Chief Constable Lowsley (Robert Daws) foists 'team building' on everyone. Somewhere in the middle of that, Reverend Mother Adrian (Carolyn Pickles) is hiding a secret big enough to shake the convent.

The vibe (and the stakes)

Behind the cheeky episode premises, the season is not afraid to throw the team into the deep end. Max Brown hints at threats to the entire operation at the station, which sounds like 'we might lose the whole setup' territory. He also flags the cases as more complex this year, with the usual Boniface brainwaves veering into places most people would not think to look — which is the point of the show, and still fun.

'Just when you think it could not get any bigger, it does.'

Lorna Watson says tensions run high but the village pulls together, and that this run is bigger in scope — the sort of local-unity energy that keeps the show warm even when the body count climbs. She also calls filming it an absolute hoot, which tracks given the phrase 'killer scarecrow' is in the mix.

Bottom line

If you are here for genteel chaos with a brainy nun solving increasingly odd crimes, season 4 looks like the most extra version yet. UK viewers: 26 September, 9pm, U&Drama. US viewers: BritBox has already opened the door.