The idyllic English riverside town of Marlow, once synonymous with peaceful strolls along the Thames and genteel community events, is bracing for another wave of murder and mayhem. The hit cozy crime series The Marlow Murder Club is officially returning for a third season in 2026, and this time the stakes are personal, the mysteries are more twisted, and the danger hits closer to home than ever before. Filming wrapped in late September 2025, with six brand-new episodes promising three gripping, standalone murder cases that blend sharp wit, clever twists, and the kind of escalating tension that keeps viewers glued to their screens.
Samantha Bond reprises her role as retired archaeologist Judith Potts, the sharp-minded leader of the amateur sleuth trio. Jo Martin returns as Suzie Harris, the no-nonsense dog walker whose street smarts and local connections prove invaluable. Cara Horgan is back as Becks Starling, the vicar’s wife whose quiet strength hides a steely resolve. Joining them is Natalie Dew as the newly promoted DCI Tanika Malik, who has reluctantly come to rely on the club’s unconventional methods. The supporting cast includes returning favorites like Phill Langhorne as DC Brendan Perry, Holli Dempsey as DC Alice Hackett, and Tijan Sarr as DC Jason Kennedy—forming a full investigative team that now officially includes the women as civilian advisors.
What sets Season 3 apart is how the crimes ripple through Marlow’s tight-knit community, turning everyday gatherings into potential crime scenes and forcing the sleuths to navigate suspicion from their own neighbors. The first two episodes, adapted in part from Robert Thorogood’s third novel The Queen of Poisons, center on the shocking sudden death of the town’s beloved mayor, Geoffrey Lushington—played by Peter Davison. Described as “the nicest man in Marlow,” his collapse during a routine town meeting leaves everyone stunned. Why would anyone poison someone so universally liked? The question drives the investigation, with traces of aconite—the infamous “queen of poisons”—found in his coffee, turning a seemingly motiveless killing into a puzzle of hidden grudges and dark secrets.
Guest stars add star power and intrigue: Nigel Harman appears as Marcus, Jacqueline Boatswain as Debbie, Sarah Alexander as Sophia, Tony Gardner as Terrence, and Jason Merrells as Paul, each bringing layers of suspicion to the mayor’s circle. The case unfolds under the watchful eyes of the entire town, with Judith, Suzie, and Becks digging into alibis, rivalries, and long-buried resentments that threaten to tear apart Marlow’s facade of civility.
The middle episodes introduce a flashy, high-society murder that contrasts sharply with the mayor’s quiet passing. A celebrity chef—portrayed by Alastair Mackenzie as Ferdy—is found lifeless at the glamorous launch of his latest cookbook, with half the town in attendance as witnesses. The event, meant to celebrate culinary triumph, turns into a nightmare of suspicion. Was it a jealous rival, a disgruntled sous-chef, or something more personal? The trio must sift through a sea of egos, secret affairs, and professional jealousies while the community reels from the loss of another prominent figure.
But the most explosive twist comes in the final two episodes: a university reunion at a creepy old manor house spirals into horror when Becks herself becomes a prime suspect in a fresh killing. The eerie setting—creaking floors, shadowed corridors, and decades-old grudges—amps up the tension as old classmates reunite, only for one to end up dead. Becks’ involvement threatens everything: her role as a civilian advisor, her friendships, and the club’s very existence. Could this case finally push the authorities to sideline the amateur detectives for good? Guest stars Harry Enfield as Hector, Cherie Lunghi as Marian, and Adrian Lukis as Matthew heighten the drama, bringing comedic flair and dramatic weight to the reunion’s deadly fallout.
Creator Robert Thorogood, the mind behind Death in Paradise, crafts these stories with his signature blend of humor, heart, and ingenuity. The show’s format—three self-contained mysteries across six episodes—allows each case to breathe while building on the characters’ evolving relationships. Judith’s crossword-solving intellect, Suzie’s grounded pragmatism, and Becks’ empathetic insight make them the perfect counterpoint to the more by-the-book police team. As civilian advisors, they now have official standing, but that status comes with scrutiny and risk, especially when one of their own falls under suspicion.
The series has captivated audiences on both sides of the Atlantic since its 2024 debut on PBS MASTERPIECE in the U.S. and U&Drama in the UK. Season 1 introduced the unlikely trio bonding over a double murder; Season 2 escalated with more personal stakes and community involvement. Season 3 promises to push boundaries further, blending cozy charm with genuine peril. The Thames-side setting remains a character in itself—picturesque boathouses, quaint high streets, and elegant homes hiding sinister truths.
Production wrapped smoothly, with Monumental Television delivering the signature high-quality visuals that make Marlow feel both inviting and foreboding. Executive producers praise the show’s enduring appeal: its celebration of clever women solving crimes through brains rather than brawn, its gentle humor, and its ability to deliver satisfying whodunits without gore or grimness.
As 2026 approaches, anticipation builds for the premiere—likely early in the year on UKTV, with PBS MASTERPIECE following suit. Fans can revisit Seasons 1 and 2 on PBS Passport or Prime Video while waiting. The Marlow Murder Club isn’t just returning—it’s evolving, with higher stakes, deeper mysteries, and the ever-present question: in a town where everyone knows everyone, who can you really trust when murder strikes close to home?
The quiet little town of Marlow is about to get loud again—and this time, the chaos might just tear the club apart.
