There are series you watch for the plot. There are those that keep you on edge with acting. And sometimes you come across something where the main characters are the setting and its atmosphere — and that's exactly what Under Salt Marsh is, a six-episode Sky Atlantic project starring Kelly Reilly. The series pulls you in like quicksand — slowly, almost imperceptibly, and by the third episode you don't want to escape, even though it's about child murder.

The fictional Welsh town of Morfa Halen exists on the edge of the map and on the edge of sanity: on one side mountains, on the other the ocean, which has long been eyeing the place, ready to swallow it whole. Former detective Jackie Ellis (Reilly) settled here as a teacher after an unsolved case involving her own niece's disappearance three years ago destroyed her career. But peace is not her forte: one night she discovers the body of her eight-year-old student in the salt marshes, and the town, already barely holding together, finally cracks at the seams.

Jackie's former partner, Detective Eric Bull (Rafe Spall), returns to Morfa Halen to lead the investigation in a community he once let down. All this unfolds against the backdrop of an approaching storm of the century, threatening to wash away both evidence and the settlement itself along with its residents.

Claire Oakley, director and creator of the series, previously acclaimed in her home country for the intimate drama "Manicure", brought a specific aesthetic vision to television. Morfa Halen is filmed in a way that makes you want to move there and stay as far away as possible at the same time: silvery water expanses, low sky where clouds look heavier than the earth itself, endless grayness (even for me, a St. Petersburg native, it was too much).

The creators also paid special attention to sound — the roar of the sea is present in almost every scene, creating the feeling that the elements are a full-fledged participant in the story. This is a visual language where the landscape rhymes with the psychological state of the characters — a technique not new, but executed here with rare consistency. Not "True Detective," of course, but something along those lines — only with a British accent and far fewer philosophical monologues.

"Under Salt Marsh" is a series in the best traditions of British detective noir: patient, methodical, and in no hurry to explain what's happening. Clues accumulate slowly — rubber boots, a footprint in the mud, a mixture of fresh and salt water in the boy's lungs. Suspects are arranged with almost Agatha Christie-like thoroughness: there's a local conspiracy theorist, a mysterious beekeeper connected to both dead children. The parallel investigation of two cases — the current one and the one from three years ago — creates that density of narrative that makes you not want to get distracted by social media. The series clearly knows what it's doing — at least for the first few episodes.

The ending, however, is a separate matter. Series creator Oakley herself admitted in interviews that three episodes were written without a clear resolution, and the killer was determined during the process: the team returned to finished episodes, retrofitting the logic. This is noticeable. The final chord feels somewhat rushed, as if the storm finally caught up not only with the town but also with the scriptwriters. The reveal is formally convincing but emotionally slightly underwhelming: at the moment when it should hit hard, it only hits halfway. And the culprit turns out to be someone who barely participates in the narrative, which somewhat devalues the story.

The main thing that draws no criticism is Kelly Reilly. After years on "Yellowstone," where her character became one of the most talked-about on American television, the actress brings entirely different qualities to Wales — quiet tension and a real storm inside. Jackie Ellis is a woman who holds on not because she is strong, but because she hasn't found another way out yet, even though she has a lover and is pregnant. She simply cannot move forward without closing the door that forced her to radically change her way of life.

Rafe Spall ("Black Mirror", "The Last Vermeer") makes a worthy counterpart — his Bull is irritating with his gullibility, yet paradoxically attractive with his rational thinking against Jackie's emotionality. And it's great that the creators denied the characters the possibility of a romantic relationship, which would have made the story more "cheap." Jonathan Pryce ("Game of Thrones", "Slow Horses") in an episodic but weighty role as Solomon Bevan adds a degree of British old-fashionedness that the scenes with him require.

"Under Salt Marsh" is one of those series worth watching for the emotions you experience during the process, not just for how they end. If you're into slow, deeply atmospheric noir — welcome to Morfa Halen. Just bring rubber boots: it's wet there.