BritBox is throwing a birthday party in September — and everyone is invited.
Even though she’s been dead for over 50 years, Agatha Christie‘s birth is still being celebrated by BritBox and fans worldwide.
The streamer’s fall 2026 programming revolves around the famous author’s birth — and the many, many adaptations that have been made of her many, many mystery novels.
BritBox is adding one more to the pile — Tommy & Tuppence, a modern update of two of Christie’s most famous characters.
For more info about BritBox’s September slate, please read Watch With Us‘ list below.
September 3: Showtrial | U.S. Exclusive, New to Canada | 5 x 60′ | Released All at Once*
When Talitha Campbell (Celine Buckens), the estranged daughter of a wealthy property developer, is charged with conspiring to murder fellow university student Hannah Ellis (Abra Thompson), the trial that follows places victim and accused — and their families — in the eye of a media storm. Into that storm enters Cleo Roberts (Tracy Ifeachor), the duty solicitor on the night of Talitha’s arrest. Refusing her father’s help, Talitha wants Cleo to lead her defense against a prosecution that is weaponizing Talitha’s gender and social privilege against her.
Season 1 arrives all at once on September 3, and then Season 2 will have a weekly release starting September 24 (more details below).
September 9, 2026: Monarch of the Glen Season 1 | New to BritBox | 8 x 50′ | Released All at Once*
Archie Macdonald left the family home in Scotland’s Highlands nearly ten years ago and had no desire to go back. When news of a family crisis reaches him, however, he reluctantly heads up to crumbling Glenbogle Castle. But far from being at death’s door, as his mother had informed him, Archie’s father is not really ill at all. Rather, it is the estate that has fallen to rack and ruin and massive debts have mounted up. Forces beyond his control conspire to make Archie stay, at least long enough for him to try and save the estate of Glenbogle. Which, of course, could take a very long time.
September 9, 2026: Monarch of the Glen Season 2 | New to BritBox | 8 x 50′ | Released All at Once*
Archie Macdonald has pledged himself to Glenbogle, his family castle in the Scottish Highlands, but now faces a titanic struggle to make the estate profitable. But rebellious tenants, local vendettas, and scheming golddiggers must be confronted as he strives to make Glenbogle a thriving tourist attraction. And then, of course, there’s Hector, his unruly and mischievous father, who finds ever more elaborate ways to frustrate his son’s endeavours. London girlfriend Justine vies with his childhood friend Katrina and the ever hopeful Lexie for Archie’s affections.
September 9, 2026: Monarch of the Glen Season 3 | New to BritBox | 11 x 50′ | Released All at Once*
Archie Macdonald remains pledged to Glenbogle, his family castle in the Scottish Highlands, but rebellious tenants, local vendettas, and scheming golddiggers must be confronted as he strives to make Glenbogle a thriving tourist attraction. And then, of course, there’s Hector, his unruly and mischievous father, who finds ever more elaborate ways to frustrate his son’s endeavours.
September 10, 2026: Cooper and Fry Season 1 | North America Premiere, BritBox Exclusive | 8 x 45′ | Released 2x on Premiere, Then Weekly*
Set in the mystery-shrouded Peak District, DC Ben Cooper (Robert James-Collier), an affable local to Edendale, is thrown together with DC Diane Fry (Mandip Gill), a guarded newcomer who has arrived from the city under mysterious circumstances.
September 15, 2026: Agatha Christie’s Tommy & Tuppence Season 1 | BritBox Original, BritBox Exclusive, North America Premiere | 6 x 45′ | Released 2x on Premiere, Then Weekly
In the first contemporary English-language Agatha Christie series adaptation, the detective duo of the impulsive Tuppence (Antonia Thomas) and lovable try-hard Tommy (Josh Dylan) rise again. Mixing what made the screwball comedy and playful romance that made this crime-solving couple beloved, with a cast representative of the energy of modern London, this series will please old fans – and new – alike. Featured in the “Secrets & Spies” collection.
September 15, 2026: Murder Most Foul (1964) | 1 x 90′
Murder Most Foul turns a quiet jury room into comedic chaos when stubborn sleuth Miss Jane Marple blocks a guilty verdict and launches her own investigation. Disguised as a would‑be actress in a seedy theatre troupe, she uncovers blackmail, backstage rivalries, and fresh corpses—risking her own life as secrets, laughter, and murder collide. Based on the novel Mrs. McGinty’s Dead by Agatha Christie. Featured in the “Secrets & Spies” and “Murders in the Village” collections.
September 15, 2026: Agatha Christie’s A Caribbean Mystery (1983)| New to BritBox | 1 x 90′
When Agatha Christie’s beloved amateur sleuth Miss Jane Marple arrives at an elegant resort for a relaxing vacation, she stumbles on a complex web of cold-blooded murders. Armed only with a mind as sharp as her knitting needles, she races against the clock to prevent a murderer from killing … again. Based on Agatha Christie’s Caribbean Mystery. Featured in the “Destination: Murder” collection.
September 15, 2026: Murder She Said (1962) | 1 x 90′
In Murder She Said, indomitable Miss Marple witnesses a strangling aboard a night train from Paddington—only to be dismissed as a doddering eccentric when no body is found. Undeterred, she poses as a railway worker and then goes undercover as a maid, uncovering skeletons in the closets of a quarrelsome country estate where secrets abound, murders multiply, and her wit proves sharper than any killer. Featured in the “Murders in the Village” collection.
September 15, 2026: The Alphabet Murders (1966) | 1 x 90′
Tony Randall stars as Agatha Christie’s redoubtable Belgian detective, Hercule Poirot, who confronts murder and mayhem when a demented killer murders in grisly alphabetical order … beginning with the initials A.A. and slashing blithely towards Z.Z. Poirot’s formidable intellectual powers are taxed to the limit as he attempts to decipher the killer’s bizarre motivations–his task made more difficult by a bumbling British intelligence agent. But in the end, despite frequently hilarious incompetence, Poirot spells out the solution. Based on Agatha Christie’s novel The ABC Murders. Featured in the “Her Darker Side” collection.
September 15, 2026: Murder at the Gallop (1963) | 1 x 90′
In Murder at the Gallop, when a wealthy recluse dies in a suspicious fall, the sharp‑witted Miss Marple (Margaret Rutherford) senses murder where others see misfortune. As greed, secrets, and suspicious relatives close in—and the body count rises—Marple pursues a single fragile clue into a deadly web of deception that nearly costs her life. In the end, the truth proves as shocking as it is unexpected. Featured in the “Murders in the Village” collection.
September 15, 2026: Murder Ahoy (1964) | New to BritBox | 1 x 90′
Murder Ahoy finds Agatha Christie’s indomitable Miss Marple (Margaret Rutherford) sailing into danger when a fellow trustee is found dead and authorities insist it was natural causes. Certain of murder, she boards a naval training ship for troubled youths, uncovering a web of thieves, secrets and suspects. As more bodies fall and comedy collides with suspense, Miss Marple risks her own life to expose a cunning killer on the high seas. Featured in the “Destination: Murder” collection.
September 15, 2026: Agatha Christie’s Murder Is Easy (1982) | New to BritBox | 1 x 90′
An American computer expert vacationing in England meets a dear, older lady aboard a train bound for London. She tells him that murder is easy as long as no one is suspected and that she is on her way to Scotland Yard to report the name of the murderer of three people in her village. But a hit-and-run driver strikes her down before she can tell her tale to the police. And the American traveler is swept into a deadly mystery as he pursues her investigation. Featured in the “A Taste for Poison,” “Murders in the Village” and “Her Darker Side” collections.
September 15, 2026: Agatha Christie’s Thirteen at Dinner (1985) | New to BritBox | 1 x 90′
The banquet’s prepared; the guests arrive; and murder pulls up a chair. Now it’s up to legendary detective Hercule Poirot to solve the gruesome murders of an English lord, an American impressionist and an aspiring young actor. Academy Award Winner Faye Dunaway stars in a dual role in this mystery based on the novel by Agatha Christie. Featured in the “Secrets & Spies” collection.
September 16, 2026 | Great Estates From Above Season 1 | North America Premiere, BritBox Exclusive | 4 x 60′ | Released All at Once*
Narrated by Bessie Carter, Great Estates from Above is a visually stunning history series that showcases Britain’s most magnificent country houses and palaces.
September 23, 2026 | Call the Midwife Season 15 | Canadian Release Only, Canadian Premiere, BritBox Exclusive | 8 x 60′ | Released Weekly*
Uncertainty surrounds the future of Nonnatus House, with the team of midwives navigating shifting expectations in a rapidly modernizing world. The midwives encounter the Women’s Liberation Movement, complex medical cases such as premature birth, placenta previa, kidney cancer, tuberculosis, and even the lingering scars of slavery.
September 24, 2026 | Showtrial Season 2 | North America Premiere, U.S. Exclusive, New to Canada | 5 x 60′ | Released 2x on Premiere, Then Weekly*
Notorious climate change activist Marcus Calderwood (Barney Fishwick) is a fierce advocate of direct, disruptive action and unapologetic about its consequences. As a result, he has as many hostile opponents as he does supporters. So when Marcus is left for dead in a roadside hit-and-run, foul play cannot be discounted. The fact that a dying Marcus named a police officer as his assailant — one with a prior grudge against him — reinforces this suspicion. If Marcus’s death really was a cold-blooded murder, what motives lay behind it?
From the victim’s last breath to the jury’s final verdict, Showtrial‘s layered characters and intriguing plot twists combine for a compelling drama built on a key question: When a trial is dominated by divisive issues and public outrage, can justice ever be served?
September 28, 2026 | Richard Osman’s House of Games Season 2 | New to BritBox | 50 x 30′ | Released All at Once*
Richard Osman hosts the game show in which he sets a panel of four celebrity contestants a series of games and puzzles to test their general knowledge.
