A detective-turned-teacher investigates a shocking crime in her small town. As a massive storm approaches, she must work with her estranged ex-partner to solve the case before evidence disappears.
Let’s talk about Kelly Reilly, because she is absolutely astonishing here. As Jackie, she carries this enormous, suffocating guilt over her niece, all while navigating a body that’s changing beneath her, a new lover she probably shouldn’t be entertaining, and a case that is reopening wounds she never truly healed. The remarkable thing about Reilly’s performance is that she doesn’t need to say much, it’s all in her eyes. Raw, enchanting, and completely magnetic. This is a career-highlight turn, and if you weren’t already a fan, you will be by the time the credits roll on the finale.
Rafe Spall delivers something equally compelling as Detective Bull, a no-nonsense enforcer with a steel exterior and a private life he keeps fiercely guarded. Bull is an undercover gay man navigating a profession that hasn’t always made space for people like him, and that tension quietly informs every scene he’s in. It’s a nuanced, layered performance that avoids every obvious trap. Spall plays it with restraint and earns every beat.
The interrogation sequences deserve a special mention. They are deep, tense, and electric, the kind of scenes where you hold your breath without realising it.
Visually, Under Salt Marsh is stunning in the most unsettling way. The dream-like sequences scattered throughout the series are shot with a precision and artistry that genuinely stops you mid-scroll of your thoughts. The colour isolation effects used in these moments are particularly striking pulling a single hue from an otherwise muted palette to create these ominous, haunting vignettes that feel more like a fever dream than a memory. It is beautifully disorienting.
The parallel structure of the two storylines is handled masterfully from a production standpoint. The editing keeps both timelines breathing without one ever suffocating the other, and the tonal consistency throughout maintains that oppressive, gloomy atmosphere that makes every new clue feel both dark and strangely rewarding. The cinematography leans heavily into the bleak, atmospheric landscapes that give the show its name and it works every single time.
The score, too, deserves recognition. It sits low and ominous beneath the drama, never overplaying, just quietly amplifying the dread.
Here is where Under Salt Marsh earns its place in the conversation about the best limited series in recent memory.
The show’s greatest achievement is how deftly it weaves its two storylines together. Jackie’s present-day case and her niece’s old case don’t just exist side by side, they mirror each other. The parallels are deliberate, thoughtfully constructed, and genuinely chilling when they click into place. It is the kind of storytelling that makes you feel clever for noticing things, and then immediately unsettled when you realise what those things mean.
The pacing is relentless in the best possible way. In the space of a single week within the narrative, the body count escalates from one to four. What starts as a grim investigation becomes something altogether more monstrous, and the show never lets you get comfortable. The mystery unveilings are dark, measured, and earned each new revelation adding another layer of gloom without ever tipping into the gratuitous.
The finale is heavy. Genuinely, emotionally heavy. Every performer steps up to a level that would be remarkable in isolation, but together they create something that hits you square in the chest. The reveal, and this is the highest compliment, I absolutely did not see coming. The dialogue in those closing scenes is so sharp, so loaded with tension, that staying still in your seat becomes a physical challenge.
Under Salt Marsh is the kind of show that stays with you. It is gloomy, gripping, brilliantly performed, and deeply human beneath all of its darkness. It comes with a full recommendation! do not sleep on this one.
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