The broadcaster unveiled plans for a winter-themed episode of its crime comedy-drama.
David Mitchell and Anna Maxwell Martin will reprise their respective roles in the festive instalment.
The series centres on an eccentric puzzle creator who is forced to impersonate his vanished identical twin sibling, a senior police officer.
Legendary television detective Sir David Suchet makes a guest appearance as a criminal suspect.
During production, Mitchell expressed his longstanding admiration for Suchet’s body of work, revealing he had watched every installment of the iconic detective programme multiple times and considered the collaboration a career highlight.
The cast also features a range of additional performers.
The narrative unfolds in the northern English countryside at a resort property decorated for the yuletide season.
When an electrical failure occurs, the holiday gathering transforms into an intricate whodunit scenario.
Severe winter conditions prevent any escape, leaving everyone stranded alongside a concealed murderer.
Suchet reflected on the novel experience of embodying a suspect rather than the investigating detective, describing it as an interesting reversal of his typical screen persona and noting his pleasure in observing Mitchell unravel the solution.
The programme’s initial run accumulated an audience exceeding 9.5 million within its first month on air, establishing it as the most-watched scripted launch on the channel since 2024 and the highest-rated comedy debut in at least eight years.
Mark Brotherhood serves as creator and principal writer, with production handled by Big Talk Studios, an ITV Studios subsidiary, in partnership with That Mitchell and Webb Company.