British TV Dramas & Mysteries · Classics & New Favourites

What's New on Acorn TV

New arrivals in September 2026 — curated for British mystery fans.

Updated September 2026 Hand-picked · Updated monthly · Affiliate links help support this site

Want everything coming this season across every service, not just Acorn TV? See British TV Hub's British TV autumn 2026 preview, or browse cozy British mysteries for autumn.

This month's must-watch

British TV Hub Pick

The one new arrival not to miss.

Acorn TV · Season 7 Binge Premiere · September 7

The Sommerdahl Murders

In a picturesque Danish seaside town, police chief Dan Sommerdahl works murder cases alongside his close friend Flemming Torp and forensic specialist Marianne, even as tensions in their personal lives spill into the investigation. Season 7 streams as a full binge premiere.

Crime dramaDanish
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Updated September 2026

New on Acorn TV: September 2026

New arrivals on Acorn TV this month — with honest notes on what's worth your time.

Acorn TV Original · Continuing★ Pick

Blue Murder Motel

Season 1
New episodes weekly through September

Retired detectives Vinny and Cole, now running a New Zealand coastal motel, keep getting pulled back into investigative work as fresh murder cases turn up in their new community.

Cozy mysteryNew Zealand
Watch on Acorn TV →
Acorn TV Exclusive · Continuing

The Assassin

Season 1
New episodes weekly through September

Keeley Hawes stars as a retired contract killer whose quiet life unravels when her estranged son comes looking for answers, forcing the pair on the run together.

ThrillerKeeley Hawes
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Binge-worthy

Acorn TV Originals Worth the Subscription Alone

A handful of Acorn TV Originals that make the service worth having on its own.

Acorn TV Original

The Chelsea Detective

4 series

Adrian Scarborough stars as a rumpled, sharp-eyed detective solving murders in one of London's wealthiest neighborhoods — a genuine Acorn TV Original with real bite beneath its polished setting.

Crime dramaAcorn TV Original
View Series →
Acorn TV Original

Signora Volpe

3 series

Emilia Fox stars as a disillusioned former MI6 operative who settles into a quiet new life in the Umbrian countryside, only to keep stumbling into local mysteries — a genuine Acorn TV Original commissioned with Route 24.

Crime mysteryAcorn TV Original
View Series →
Acorn TV Original

Art Detectives

Series 1

DI Mick Palmer (Stephen Moyer) and DC Shazia Malik solve murders connected to the world of art and antiques, from Old Master paintings to Banksy street art.

British mysteryStephen Moyer
View Series →
Acorn TV Original

Dalgliesh

3 series

Bertie Carvel stars as P.D. James's enigmatic poet-detective in this atmospheric Acorn TV Original, based on the bestselling Adam Dalgliesh mystery novels.

Crime dramaAcorn TV Original
View Series →

Explore More

BritBox Guide
BritBox Guide
This month's new arrivals and premieres, plus the BritBox Originals worth the subscription alone.
Read Guide →
PBS Masterpiece Guide
PBS Masterpiece Guide
Everything airing on PBS Masterpiece right now — premiere dates and returning favourites.
Read Guide →
Where to Watch British TV
Where to Watch British TV
The complete guide to every streaming service worth having in the US.
Read Guide →
Best British Mysteries on Acorn TV
Best British Mysteries on Acorn TV
The evergreen best-of list, organized by mood rather than by month.
Read Guide →
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