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BritBox delivers a wide range of British TV series to audiences in the United States and Canada. And over the next month, viewers have a ton of new content to look forward to, especially Agatha Christie fans who want to celebrate her birthday on September 15 with a new TV and movie binge.
From mysteries to family dramas and a bit of British humor thrown into the mix, there's something for everyone. Here are the new shows hitting BritBox this September that you definitely won't want to miss.
Scroll to see all the BritBox shows you should queue up in September 2026!
Agatha Christie's Tommy & Tuppance — Stream on BritBox September 15, 2026
Courtesy of BritBox, Photo: Lara Cornell
The Queen of Crime’s most dynamic duo returns in the first contemporary English-language television adaptation of the classic stories. Starring Antonia Thomas as the impulsive Tuppence and Josh Dylan as the well-meaning Tommy, this breezy mystery brings playful romance, screwball comedy, and sharp modern wit to London's twistiest cases just in time for Christie's birthday celebration on September 15.
Eras of Agatha Christie — Stream on BritBox September 15, 2026
BritBox
While you can tune into Agatha Christie's Towards Zero — a three-part murder mystery adaptation available on BritBox now — you can celebrate the author's actual birthday by diving into a curated collection of timeless Christie classics. Spanning vintage adaptations starring Margaret Rutherford and Tony Randall alongside modern reimaginings, this special streaming event explores every facet of the iconic author’s literary legacy. All available on September 15, programming includes Murder Most Foul (1964), Agatha Christie’s A Caribbean Mystery (1983), Murder She Said (1962), The Alphabet Murders (1966), Murder at the Gallop (1963), Murder Ahoy (1964), Agatha Christie’s Murder Is Easy (1982), Agatha Christie’s Thirteen at Dinner (1985).
Monarch of the Glen, Seasons 1-3 — Stream on BritBox September 9, 2026
BritBox
Escape to the breathtaking, moody Scottish Highlands in this beloved comedy-drama about reluctant laird Archie Macdonald. Left with a crumbling castle and massive family debts, Archie struggles to make the historic Glenbogle estate profitable while wrangling eccentric local tenants, mischievous family members, and a complicated web of old and new romances.
Cooper & Fry, North America Premiere — Stream on BritBox September 10, 2026
BritBox
Set against the moody, fog-draped backdrop of the Peak District, this gripping mystery pairs affable local detective Ben Cooper with Diane Fry, a guarded city transplant running from her past. Together, they navigate remote farms, ancient stone circles, and dark local secrets to crack high-stakes crimes.
Showtrial — Stream on BritBox September 3, 2026
BritBox
When Talitha Campbell, the estranged daughter of a wealthy property developer, is accused of conspiring to murder a fellow university student, a national media frenzy erupts. Duty solicitor Cleo Roberts takes on her defense, driving a tense, provocative legal thriller that forces viewers to question how class, privilege, and public perception influence the scales of justice.
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