Sky has dropped the first look at Under Salt Marsh, a gripping new six-part crime thriller starring Yellowstone’s Kelly Reilly and Trying’s Rafe Spall. Set to debut in 2026, the series promises to deliver storm-lashed suspense, dark secrets, and a tense reunion between former partners forced back into the line of fire.

What Under Salt Marsh Is About

The series is set in the fictional Welsh coastal town of Morfa Halen, where a once-in-a-generation storm barrels in from the sea. Reilly stars as Jackie Ellis, a former detective turned teacher whose life was derailed three years earlier by a devastating cold case. The mystery shattered her career and fractured her family’s trust—until a shocking discovery pulls her back into the investigation.

The synopsis teases that Jackie must reunite with her estranged police partner, Eric Bull (Spall), as they re-open the wounds of the past. Together, they confront a grief-stricken community full of secrets, racing against time before the incoming storm washes away the evidence for good.

Billed as a chilling blend of atmospheric crime storytelling and a human portrait of resilience, Under Salt Marsh looks set to deliver both edge-of-your-seat tension and emotional depth.

A Stacked Cast

Alongside Reilly and Spall, the series features an impressive supporting cast:

• Jonathan Pryce (The Crown)

• Naomi Yang (Chimerica)

• Dinita Gohil (Treason)

• Brian Gleeson (Bad Sisters)

• Kimberley Nixon (Queenie)

• Harry Lawtey (Industry)

The series is created, written, and directed by Claire Oakley (Make Up), promising a distinctive and cinematic vision.

When Will It Air?

While no exact premiere date has been confirmed, Sky has revealed that Under Salt Marsh will launch on Sky and NOW in 2026.

Until then, Sky has a busy lineup for viewers this autumn, including The Iris Affair (starring Tom Hollander and Niamh Algar) and Sarah Snook-led thriller All Her Fault.

Why Fans Are Excited

Kelly Reilly has already proven her ability to embody complex, fiery characters with her unforgettable turn as Beth Dutton in Yellowstone. Her new role as Jackie Ellis offers something different but equally powerful—a fallen detective forced to confront both her past and a community drowning in secrets.

With stormy Welsh landscapes, high-stakes drama, and two powerhouse leads, Under Salt Marsh looks destined to be one of 2026’s most talked-about crime dramas.