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The dark and grisly drama, which has since won multiple awards since it first aired in 2014, will see Sarah Lancashire reprise her role as troubled police officer Sergeant Catherine Cawood.
More familiar faces will also be returning for the show’s final outing: James Norton will once again be playing Catherine’s nemesis, the murderer and sex-offender Tommy Lee Royce.
Elsewhere, Siobhan Finneran, who plays recovering addict and Catherine’s sister, Clare Cartwright, will be returning, with more cast members due to be announced in due course.
Filming for the show’s final season will start in 2022, marking six years between the explosive second season closer, and the final chapter in the Happy Valley story.
Averaging an impressive audience of 9.3 million viewers, the first two series each won the BAFTA Television awards for both Drama Series and Writing: Drama for Sally Wainwright, with Sarah Lancashire winning the BAFTA Television award for Leading Actress for series two.
Season three will be comprised of six episodes, with a plot summary of the show reading: “When Catherine discovers the remains of a gangland murder victim in a drained reservoir it sparks a chain of events that unwittingly leads her straight back to Tommy Lee Royce.
“Her grandson Ryan is now sixteen and still living with Catherine, but he has ideas of his own about what kind of relationship he wants to have with the man Catherine refuses to acknowledge as his father.
“Still battling the seemingly never-ending problem of drugs in the valley and those who supply them, Catherine is on the cusp of retirement.”
Speaking about the new series, Happy Valley creator Sally Wainwright explained: “I'm delighted to find myself back in the world of Catherine Cawood and her family and colleagues for the final instalment of the Happy Valley trilogy.
“It’s been wonderful to see the lasting impact this series has had on audiences all over the world. I’m thrilled that Sarah, James and Siobhan are back on board for what I hope will be the best season yet, and thrilled once again to be working with the wonderful team at Lookout Point, the BBC and our new colleagues at AMC.”
James Norton added: “To take on Tommy one final time is a wonderful and daunting privilege, and something I’ve been looking forward to since we wrapped the last series, six years ago. I’m so excited to be working with the insanely talented Sally and Sarah again. Thinking we should all go on one last barge holiday, for old times’ sake.”
Meanwhile, Sarah Lancashire only cryptically said: “It’s time to let the dog see the rabbit.”
“When Happy Valley first launched on the BBC in 2014, it changed the landscape of crime drama completely,” Piers Wenger, director of BBC drama said. “Sally has crafted a magnificent conclusion that is sure to make this third and final series one of television’s most highly anticipated and unmissable moments. Huge thanks go to Sally, Sarah and the Lookout Point team, plus James and Siobhan, for coming together for this special moment, and we’re delighted to welcome AMC on board this final series.”
Happy Valley will air on BBC One next year. The show is available to watch on BBC iPlayer and Netflix.
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