Kelly Reilly, who is best known for playing Beth Dutton in the hit Paramount series Yellowstone, will star in a new Sky Original crime drama alongside Rafe Spall

Yellowstone’s Kelly Reilly is set to star in a gripping new crime drama, as revealed in a thrilling teaser trailer released today.

The British actress, famed for her role as Beth Dutton in the popular Paramount Western series, will share the screen with Trying’s Rafe Spall in the forthcoming Sky Original, Under Salt Marsh.

A new, full trailer release today (Friday, 19th December) teases a chilling investigation into a grim cold case along the Welsh coastline.

The eerie yet captivating new footage offers viewers their initial glimpse of Reilly and Spall as Jackie Ellis and Detective Eric Bull, former partners entangled in their fictional town of Morfa Halen’s murky past.

Joining the leading duo are several familiar faces from recent hit series, including The Crown and Slow Horses legend Jonathan Pryce, reports Wales Online.

Rounding out the stellar supporting cast are Naomi Yang (Chimerica), Jonathan Pryce, Dinita Gohil (Treason), Brian Gleeson (Bad Sisters), Kimberley Nixon (Queenie) and Harry Lawtey (Industry).

The series synopsis reads: “Created, written and directed by Claire Oakley (Make Up), the six-part series opens as a once-in-a-generation storm rolls in from the sea.

“Former detective turned teacher Jackie Ellis makes a shocking discovery that reopens the wounds of a three-year-old cold case which cost her both her career and her family’s trust.

“Forced to reunite with her estranged police partner Eric Bull, Jackie is drawn back into an investigation that will shake Morfa Halen to its core.

“Together, they must confront a community haunted by secrets and fractured by grief, before the incoming storm washes away the evidence forever.”

Sky ultimately pledges the series “blends atmospheric crime storytelling with a deeply human portrait of resilience and community”.

Under Salt Marsh marks one of Reilly’s initial projects after wrapping up Yellowstone’s fifth and final season.

Nevertheless, she’s anticipated to return to her beloved character in a forthcoming spin-off that will explore her ongoing romance with ranch foreman Rip Wheeler (portrayed by Cole Hauser).

The planned sequel is rumoured to be called The Dutton Ranch and is scheduled to debut in 2026.

Under Salt Marsh premieres on Sky and NOW in 2026. Yellowstone is available to stream on Paramount+.