Sky Unveils Gripping Trailer for ‘Under Salt Marsh’: Kelly Reilly and Rafe Spall Lead Haunting Welsh Crime Thriller

By Entertainment Desk December 21, 2025

Sky has released the official full trailer for its highly anticipated Original crime drama Under Salt Marsh, starring Yellowstone favorite Kelly Reilly and acclaimed actor Rafe Spall. The six-episode miniseries, created by Claire Oakley, premieres on Sky and streaming service NOW on January 30, 2026.

skygroup.sky

Kelly Reilly and Rafe Spall lead Sky Original Under Salt Marsh as …

Promotional key art for Under Salt Marsh, featuring the stormy Welsh coastal backdrop.

Set in the fictional tight-knit Welsh town of Morfa Halen – precariously perched between towering mountains and a relentlessly encroaching sea – the series opens with a once-in-a-generation storm brewing offshore. Former detective turned teacher Jackie Ellis (Reilly) discovers the body of her 8-year-old pupil, Cefin, apparently drowned. This harrowing find revives traumatic memories of a three-year-old unsolved case: the disappearance of Jackie’s niece, Nessa, which shattered her career and eroded her family’s trust.

digitalspy.com

Under Salt Marsh – Official Trailer (Sky)

Kelly Reilly as Jackie Ellis in a tense moment from Under Salt Marsh.

Convinced the incidents are connected, Jackie is forced to reunite with her estranged former police partner, Detective Eric Bull (Spall), who returns to lead the investigation in a community he once failed. As the storm intensifies, threatening to wash away vital evidence, the duo races to unearth long-buried secrets before the town – and the truth – is swallowed by the sea.

digitalspy.com

Gripping” new Wales-set detective drama with ‘once-in-a-generation …

Rafe Spall as Detective Eric Bull alongside Kelly Reilly.

The trailer teases atmospheric tension reminiscent of Broadchurch, blending brooding cinematography of the Welsh coast with emotional depth. Reilly, showcasing her native British accent in a more restrained role than her fiery Beth Dutton, delivers a compelling portrait of grief and determination. Spall brings nuanced intensity to Bull, highlighting their fractured partnership.

deadline.com

Under Salt Marsh’ Sky Trailer Drops With Kelly Reilly & Rafe Spall

A dramatic scene capturing the impending storm over Morfa Halen.

Supporting cast includes Jonathan Pryce (The Crown), Naomi Yang, Harry Lawtey (Industry), Dinita Gohil, Brian Gleeson (Bad Sisters), Kimberley Nixon, Mark Stanley, Dino Fetscher, and others, portraying a community bound by nature yet fractured by unthinkable crimes.

Oakley directs the majority of episodes, with Mary Nighy helming two. She co-wrote with Jonathan Harbottle and Nikita Lalwani. Produced by Little Door Productions in association with Sky Studios, with support from Creative Wales, the series also features Reilly as an executive producer.

Under Salt Marsh promises intimate, cinematic storytelling exploring resilience, loss, and secrecy against a stunning yet perilous backdrop. As anticipation builds, this moody thriller looks set to captivate audiences seeking intelligent British crime drama.