Agatha Christie’s Most Underrated Detectives Get a Modern Makeover in New BritBox Series

Agatha Christie’s Tommy and Tuppence are stepping into the 21st century.

BritBox has unveiled the official trailer for Agatha Christie’s Tommy & Tuppence, a six-part series that brings the author’s lesser-known detective duo to present-day London. Starring Antonia Thomas and Josh Dylan, the new adaptation offers a contemporary take on two characters who have been solving mysteries together for more than a century.

The series premieres on September 15 on BritBox, timed to coincide with Agatha Christie’s birthday.

Tommy and Tuppence return in a contemporary mystery

Tommy and Tuppence may not have the same profile as Hercule Poirot or Miss Marple, but they hold a distinctive place in Christie’s work. The pair first appeared in the 1922 novel The Secret Adversary and went on to feature across four novels and a collection of short stories.

Unlike many of Christie’s detectives, Tommy and Tuppence’s lives develop alongside their cases. Their adventures take them from detective work to British Intelligence, while their relationship evolves from young partners into a married couple and, eventually, retirees. Their final appearance came in Christie’s 1973 novel Postern of Fate, in which they investigate a mystery from their new country home.

The new series brings that relationship into modern London, placing the pair at the centre of a fresh run of mysteries while retaining the romantic tension that has always been part of their story.

It is also the first contemporary English-language television adaptation of Christie’s stories featuring the duo.

What is Tommy & Tuppence about?

At the heart of the series are two people whose complicated personal history is closely tied to their talent for solving crimes.

The official synopsis describes Tommy and Tuppence as a detective partnership that has endured through love, breakups and reunions, all while they tackle a succession of entertaining mysteries.

Antonia Thomas plays Tuppence, an actress portrayed as a determined force of nature who refuses to accept no for an answer. Josh Dylan plays Tommy, a meticulous and charming crime writer who has lost his enthusiasm for his work before Tuppence’s return gives him a renewed sense of purpose.

Their contrasting personalities remain central to the partnership. Tuppence is impulsive and energetic, while Tommy brings a more measured and thoughtful approach to their investigations. That dynamic has long defined the characters in Christie’s original stories.

Antonia Thomas and Josh Dylan lead the cast

Thomas, known for The Good Doctor, takes on the role of Tuppence, while Dylan, whose credits include Buccaneers and Mamma Mia 2, plays Tommy.

Joining them is Imelda Staunton, who plays Tommy’s Aunt Ada. The Harry Potter and Paddington star portrays Ada as a sharp-witted retired private detective with a formidable personality and a strong affection for her great-nephew.

The supporting cast includes Nicholas Richardson, known for Wu-Tang: An American Saga and Younger; Charlie Condou, whose credits include Dr. Who and Unforgotten; Callie Cooke from F1 and Cheaters; and Chizzy Akudolu, known for Little Disasters and The Woman in the Wall.

The wider guest cast also includes Sebastian De Souza, Sean Pertwee, Saffron Burrows, Alex Jennings, Denise Black and Alice Krige.

Who is behind the new adaptation?

The series is written by Phoebe Eclair-Powell, whose previous work includes The Road Trip and Harm. It marks her first drama series commission for television.

Fergus O’Brien, known for Happy Valley and The Tourist, directs the first four episodes, while Ellie Heydon, whose credits include Outrageous and Trying, directs the final two.

The six-episode production comes from Lookout Point, part of BBC Studios, in association with Agatha Christie Limited, with BritBox serving as lead commissioner.

When does Tommy & Tuppence premiere?

Agatha Christie’s Tommy & Tuppence premieres September 15, 2026, on BritBox.

The six-part series marks another screen adaptation of Christie’s work, but this time puts one of her most enduring detective partnerships into a contemporary setting. For longtime Christie fans, it offers the chance to see Tommy and Tuppence tackle mysteries in a world far removed from the period in which their original adventures were written.