Overview

• Masterpiece PBS released first images confirming production has wrapped on a six-episode third season that presents three new mysteries, including a poisoned mayor, a cookbook launch death, and a manor-house reunion case.
• Series leads Samantha Bond, Jo Martin, Cara Horgan, and Natalie Dew return, joined by Season 2 guest Hugh Quarshie and returning officers Phill Langhorne, Holli Dempsey, and Tijan Sarr.
• Newly announced guest stars include Nigel Harman, Peter Davison, Jacqueline Boatswain, Sarah Alexander, Tony Gardner, Jason Merrells, Harry Enfield, Cherie Lunghi, Adrian Lukis, and Alastair Mackenzie.
• Episodes 1–2 adapt Robert Thorogood’s Queen of Poisons, co-written by Thorogood and Daniel Rusteau, with Episodes 3–4 written by Amy Reith and Episodes 5–6 by Julia Gilbert.
• Season 3 debuts in 2026 on Masterpiece PBS, while Seasons 1–2 stream via PBS and PBS Masterpiece on Prime Video, with UK broadcasts on U and U&DRAMA.