The Welsh crime thriller Under Salt Marsh turned up the tension in its fourth episode, which aired on February 13, 2026, on Sky Atlantic. Episode 4 brings major revelations, fresh murders, and a rising storm that physically traps the small coastal town of Morfa Halen just as secrets begin flooding out. The hour-long episode shifts the investigation into higher gear while making everything more complicated for former detective Jackie Ellis and her former partner DC Eric Bull.
Solomon’s Shocking Confession About Nessa’s Body Rocks the Community
The biggest moment in Under Salt Marsh Episode 4 comes when Solomon makes a stunning confession. He admits that three years ago, he discovered the body of Jackie’s niece, Nessa, on his own land. Instead of calling the police, Solomon wrapped her badly burned body in a tarpaulin and buried it in toxic waste on his property .
Solomon claims he hid the body to protect his family and his livelihood. He knew that reporting the discovery would bring unwanted attention to his business and possibly implicate him in something he didn’t do. His confession explains why Nessa’s body never surfaced after her disappearance, but it raises even more questions. Why wait three years to tell the truth? Did he know more about what actually happened to Nessa? And most importantly, does his act of hiding a body make him responsible for her death ?
“The acts of Solomon make the investigation more complicated as they indicate that there are other individuals who might have more to share than they did.”
The confession does not clear up the mystery. Instead, it proves that multiple people in Morfa Halen have been keeping secrets about the night Nessa vanished. Under Salt Marsh makes it clear that covering up a crime can be just as damaging as committing one.
Autopsy Results Link Nessa’s Death to Cefin’s Murder
Under Salt Marsh Episode 4 also delivers critical forensic evidence that changes everything about the investigation. The autopsy on Nessa’s remains reveals that she was suffocated before being set on fire . This detail matches exactly with how 8-year-old Cefin was killed. His body showed signs of suffocation before he was placed in the water.
This connection confirms what Jackie suspected all along: the two deaths are related. The same person may be responsible for both killings. The investigation now shifts from treating Nessa’s case as a cold disappearance to treating it as an active murder investigation with a potential serial killer operating in Morfa Halen .
Under Salt Marsh uses this forensic parallel to raise the stakes. A single killer walking free in a small, isolated community creates a terrifying situation for everyone trapped there.
Dylan’s DNA Places Him at the Scene of Cefin’s Death
Suspicion falls heavily on Dylan in Episode 4. Forensic examiners find hair on Cefin’s clothing that matches Dylan’s DNA . This evidence puts Dylan directly in contact with the murdered child, making him a prime suspect.
However, the police handling of this evidence raises eyebrows. The lead investigator does not immediately arrest Dylan or question him aggressively. This hesitation suggests either personal connections at play or a belief that the DNA evidence alone does not prove murder .
Under Salt Marsh leaves viewers wondering whether Dylan is truly guilty or simply in the wrong place at the wrong time. The show continues its pattern of spreading suspicion across multiple characters rather than pointing to an obvious villain.
The Return of Jackie’s Sister Lydia Brings Personal Pain to the Surface
Under Salt Marsh Episode 4 introduces Lydia, Jackie’s estranged sister and Nessa’s mother. Lydia returns to Morfa Halen after years away, and her reunion with Jackie is filled with bitterness and unresolved grief .
The two sisters share a painful history involving a missing child situation that deeply affected Jackie’s career and personal life. Their conversation brings out years of blame and guilt. Lydia clearly holds Jackie responsible in some way for what happened to Nessa, though the exact circumstances remain unclear.
This subplot adds emotional weight to the crime drama. Under Salt Marsh shows how old trauma continues to shape every decision these characters make. The personal conflict between the sisters also affects the investigation, as Jackie must deal with family pain while trying to solve her nephew’s murder.
August Antonov Dies as the Storm Cuts Off Morfa Halen
Just when the investigation seems to be making progress, Under Salt Marsh Episode 4 throws in another death. August Antonov is found dead in the rising flood waters . Before his death, August had learned about illegal waste being brought into the area. This information points to environmental crimes and possible corruption stretching beyond the small town.
August’s death comes as a tidal storm surge begins battering Morfa Halen. The rising water cuts the village off from the outside world. Emergency services cannot get in, and residents cannot get out. This physical isolation mirrors the emotional isolation felt by everyone in town .
Under Salt Marsh uses the storm as more than just atmospheric background. The flooding traps potential witnesses together with potential killers. The chances of the murderer still being in town increase dramatically when escape becomes impossible.
“In Under Salt Marsh, the challenging factor that affects narrative stakes is geography.”
The Investigation Turns Inward as Suspicion Grows
By the end of Under Salt Marsh Episode 4, the investigation has completely turned inward. All evidence points to someone inside Morfa Halen. Solomon’s confession proves that community members hid evidence for years. Dylan’s DNA places him with the victim. August’s knowledge of illegal dumping suggests organized criminal activity .
No one gets arrested in this episode. No one gets cleared either. Under Salt Marsh continues its careful building of suspicion across multiple characters. The show refuses to offer easy answers or obvious villains. Instead, it focuses on how small communities fracture when secrets start coming out.
The forensic evidence, the personal confessions, and the new murder all point toward a web of corruption and violence centered in Morfa Halen. But the specific connections between these elements remain unclear. Viewers know more than they did before, but they still cannot identify the killer.
Where to Watch Under Salt Marsh Episode 4
Under Salt Marsh Episode 4 premiered on Sky Atlantic on February 13, 2026, at 9pm GMT . Viewers can also watch it on NowTV, where episodes become available for streaming at around 8am GMT the same day. The episode runs approximately 51 minutes and includes subtitle options on catch-up services .
The series is a Sky original production and currently airs exclusively in the UK. International release details remain unclear at this time .
Under Salt Marsh has been greenlit for a total of six episodes. Episode 4 represents the turning point of the series, with two episodes remaining after this one .
What Under Salt Marsh Episode 4 Means for the Rest of the Series
Under Salt Marsh Episode 4 moves the story forward significantly while maintaining the atmospheric tension that defines the series. Solomon’s confession explains why Nessa’s body stayed hidden for three years. The autopsy results confirm Jackie’s theory that the same person killed both Nessa and Cefin. Dylan’s DNA gives investigators a solid lead. August’s death introduces a possible corruption angle that could explain why certain people in town acted the way they did .
The storm isolating Morfa Halen raises the stakes for everyone. With two episodes left, the killer cannot escape, but neither can the potential victims. Everyone in town must confront the possibility that a murderer lives among them.
Under Salt Marsh continues to prioritize character complexity over simple whodunit plotting. The show treats every suspect as a fully realized person with motives and secrets that may or may not connect to murder. This approach makes the mystery more compelling and the eventual revelation more meaningful.
The town of Morfa Halen itself plays a crucial role in the story. Nestled between mountains and a fast-encroaching sea, the community has always lived with environmental pressure . Now that pressure becomes part of the narrative as the storm literally cuts the town off from help.
Episode 4 ends with Morfa Halen isolated, frightened, and full of secrets. The truth about who killed Nessa and Cefin remains hidden somewhere in the community. With two episodes remaining, Under Salt Marsh seems poised to deliver answers while maintaining the emotional and atmospheric depth that makes the series stand out.
For more gripping recaps, breaking entertainment news, and exclusive updates on your favorite Sky Atlantic and streaming series, keep reading VvipTimes. We bring you the latest from Morfa Halen and beyond.
