The Marlow Murder Club Reveals Star-Studded Season 3, Premieres 2026

Season 3 of The Marlow Murder Club, a cozy mystery series on PBS Masterpiece, has finished filming and will premiere in 2026. The new season adapts Robert Thorogood's third book, The Queen of Poisons, featuring three high-profile murders including the sudden death of Marlow's mayor, a celebrity chef found dead at a cookbook launch, and an eerie manor house investigation where Becks Starling becomes a suspect. The core trio—Judith Potts, Suzie Harris, and Becks Starling—now work more closely with newly promoted DI Tanika Malik's police team, expanding their roles as civilian advisors. The season also boasts numerous guest stars such as Peter Davison, Nigel Harman, Harry Enfield, Cherie Lunghi, and others, appearing across the six episodes written by Daniel Rusteau, Robert Thorogood, Amy Reith, and Julia Gilbert. Season 2 concluded with a suspenseful finale revealing the true killer of Kit Harcourt, highlighting the show's clever twists and character complexities. The series continues to blend mystery with character-driven storytelling, maintaining its popularity amongst fans of the genre.