Overview
- BBC One will air the feature-length special on Sunday, December 28 at 8:30pm, with the 90-minute episode also streaming on iPlayer.
- A synopsis outlines a locked-room style mystery after an office party, as four co-workers wake to find a stranger shot in their villa pool and investigators trace the gun to a drawer thousands of miles away in Swindon, with publicity also teasing help from a familiar face.
- Don Gilet leads as DI Mervin Wilson, joined by returning regulars Shantol Jackson, Shaquille Ali-Yebuah, Élisabeth Bourgine and Ginny Holder.
- The guest cast includes Josie Lawrence, Kate Ashfield, Pearl Mackie, James Baxter, Billy Harris, Oriana Charles and Alix Serman.
- Reports indicate Commissioner Selwyn Patterson does not appear in this episode, and a 15th series is expected in early 2026 with no official date yet.