BritBox is heading into fall with a fresh take on Agatha Christie, returning cozy mysteries, and plenty of murder to solve.
Leading the streamer’s Fall 2026 slate is Agatha Christie’s Tommy & Tuppence, a modernized take on Christie’s beloved crime-solving duo starring Antonia Thomas, Josh Dylan, and Imelda Staunton.
Premiering September 15 on Christie’s 136th birthday, the series kicks off BritBox’s month-long “Eras of Agatha Christie” celebration, which brings together classic and contemporary adaptations inspired by the Queen of Crime.
But the mysteries don’t stop there. David Mitchell returns for Ludwig Season 2 on October 13, while Timothy Spall and Gwyneth Keyworth reunite for Death Valley Season 2 on November 17. Also on the way are Time Season 3, starring David Tennant, and the fourth season of Blue Lights.
Read on for a closer look at what’s coming to BritBox this fall.
BritBox / Lookout Point
BritBox Fall Preview
September: “Eras of Agatha Christie” – BritBox celebrates the Queen of Crime with “Eras of Agatha Christie.” Leading up to the September 15 premiere of Tommy & Tuppence, viewers can revisit the Dame’s classic mysteries starring Miss Marple and Hercule Poirot, alongside a new generation of Christie adaptations, including Why Didn’t They Ask Evans?, Murder Is Easy, and Towards Zero.
Every week, BritBox will explore a new chapter of Christie’s legacy with a selection of titles tied to a theme, including “A Taste for Poison,” “Secrets & Spies,” “Destination: Murder,” “Murders in the Village,” and “Her Darker Side.”
- September 15: Agatha Christie’s Tommy & Tuppence Season 1 – “Secrets & Spies” Collection
A six-part contemporary mystery series on BritBox that modernizes the famous crime-solving duo. It follows actress Tuppence and crime writer Tommy as these exes reunite and tackle modern London mystery cases. - September 15: Murder Most Foul (1964) – “Secrets & Spies” and “Murders in the Village” collections.
Miss Marple (Margaret Rutherford) launches her own investigation after refusing to convict a murder suspect, going undercover in a theater troupe where blackmail, secrets, and more murders await. - September 15: Agatha Christie’s A Caribbean Mystery (1983) – “Destination: Murder” collection.
Miss Marple’s relaxing vacation turns deadly when she uncovers a string of murders at an elegant resort. - September 15: Murder She Said (1962) – “Murders in the Village” collection
Miss Marple (Margaret Rutherford) witnesses a murder aboard a train but is dismissed when no body is found. Determined to prove what she saw, she goes undercover and uncovers deadly secrets at a country estate. - September 15: The Alphabet Murders (1966) – “Her Darker Side” collection.
Tony Randall stars as Hercule Poirot, who hunts a killer committing murders in alphabetical order while trying to decipher the deadly pattern before it reaches Z. - September 15: Murder at the Gallop (1963) – “Murders in the Village” collection.
Miss Marple (Margaret Rutherford) suspects murder after a wealthy recluse dies in a suspicious fall, leading her into a deadly web of greedy relatives, secrets, and deception. - September 15: Murder Ahoy (1964) – “Destination: Murder” collection
Miss Marple (Margaret Rutherford) suspects foul play after a fellow trustee’s death and boards a naval training ship to investigate, uncovering a web of secrets, suspects, and murder. - September 15: Agatha Christie’s Murder Is Easy (1982) – “A Taste for Poison,” “Murders in the Village” and “Her Darker Side” collections.
An American computer expert vacationing in England is drawn into a mystery after an elderly woman he meets on a train is killed before she can report a suspected murderer to Scotland Yard. - September 15: Agatha Christie’s Thirteen at Dinner (1985) – “Secrets & Spies” collection.
Hercule Poirot investigates a string of murders involving an English lord, an American impressionist, and a young actor. Faye Dunaway stars in a dual role in the Agatha Christie mystery.
BBC/Big Talk Studios /Olly Courtney
October 13: Ludwig Season 2
Puzzle setter and “master of all things cryptic” John “Ludwig” Taylor (David Mitchell) is now a police consultant tackling “impossible” crimes, no longer having to pose as his identical twin brother. But with James still missing, John is forbidden from using police resources to investigate his disappearance. That won’t stop him or Lucy (Anna Maxwell Martin) from searching for answers and trying to bring James home.
November 17: Death Valley Season 2
Janie (Gwyneth Keyworth) is now a Detective Inspector, with John (Timothy Spall) serving as Mid Wales Police’s new civilian consultant. But new responsibilities, family issues, and a murder on the set of an epic production leave both questioning what comes next.
TBA: Time Season 3
Prison chaplain Marie-Louise (Siobhan Finneran) clashes with veteran officer Bailey (David Tennant) after tragedy strikes a young offenders institution, while two teenage inmates struggle with the realities of incarceration.
TBA: Blue Lights Season 4
With probation behind them, Grace (Sian Brooke), Tommy (Nathan Braniff), and Annie (Katherine Devlin) face a growing drug trade, strained police resources, and rising violence in Northern Ireland that puts Blackthorn Station under pressure.