‘All Her Fault’: Sarah Snook Delivers a Ferocious, Heart-Stopping Performance in Peacock’s Newest Thriller

Peacock’s latest psychological drama, All Her Fault, arrives with the weight of enormous expectation—and meets it with astonishing force. Led by Sarah Snook, fresh off the towering success of Succession, the series transforms a familiar premise—a missing child, a desperate mother, a town full of secrets—into a meticulously crafted thriller that grips from its opening moments and never loosens its hold.

The trailer, released this week, offers only a glimpse of the emotional tempest to come. “Whatever it takes,” Snook says, her voice cracking under the pressure of maternal terror. It’s a promise the character, Marissa Irvine, keeps across eight tightly wound episodes, each one more claustrophobic than the last.

The drama begins with a moment that is every parent’s nightmare. Marissa arrives to collect her young son from a playdate, only to be met by confusion, then fear, then the gutting realization that he is nowhere to be found. What should have been a straightforward pickup becomes the catalyst for a town-wide panic—and a personal unraveling that Snook plays with extraordinary precision.

At the heart of the story lies the unlikely bond between Marissa and Jenny, a fellow working mother portrayed with aching vulnerability. The two women first connected at a school social—a painful evening dominated by the hyper-organised, PTA-obsessed Sarah Larsen (played with sharpened sweetness by Melanie Vallejo). The event was a masterclass in the social minefields of modern parenthood, where every conversation is a competitive performance and every parent is judged for their choices.

This early scene, executed with biting humor, becomes the foundation for a deeper emotional tether. Marissa and Jenny recognize in each other that specific cocktail of guilt, exhaustion, and resentment that often shadows working mothers. Their husbands remain well-intentioned but frustratingly disengaged, clinging to the outdated belief that childcare is somehow a shared task carried more heavily by one partner than the other. The series mines this tension without slipping into caricature; instead, it paints a portrait of domestic imbalance that rings painfully true.

Jenny’s guilt over the missing child is immediate and crushing. She was the one who hired Carrie, the nanny at the center of the crisis. She trusted her. She let her in. And now—Jenny believes—she has endangered a child. Her husband insists he would have vetted the nanny more carefully if the task had fallen to him. The series captures this dynamic with uncomfortable accuracy: blame couched in rationality, gender roles disguised as logic.

But Marissa refuses to blame Jenny. She reserves that for herself—and for every mother who has ever felt she should have seen something coming, done something differently, been someone better. And while Marissa shoulders the emotional burden, the outside world soon joins in. The media, the town’s parents, strangers online—all become experts in her failings. Snook portrays this gauntlet with such rawness that viewers can almost feel the walls closing in.

What makes All Her Fault stand out, however, is not just its central mystery, but the remarkable attention to character detail. Sarah Larsen, the PTA chair and suburban frenemy, is not written as a one-note antagonist. Her passive aggression, her sugary hostility, her Machiavellian organizational zeal—all are rendered with nuance. Vallejo’s performance elevates the character from stereotype to fully realized figure, embodying the social pressures and micro-hierarchies that so often define school-gate culture.

The secondary storylines also shine. Jenny’s arc, in particular, becomes a portrait of a woman forced to confront her own self-doubt and emerge stronger under unimaginable pressure. These subtle, human threads enrich the broader mystery, transforming what might have been a conventional thriller into a layered study of motherhood, friendship, and societal judgment.

Narratively, the series is a triumph of structure. Seeds planted quietly in early episodes bloom later with devastating clarity. Clues interlock like gears, driving the story forward with breathless efficiency. There are no wasted scenes, no unnecessary red herrings. Each revelation lands with the weight of inevitability, earning both the shock and the emotional resonance that follow.

By its final moments, All Her Fault proves itself not merely a terrifying thriller, but an unexpectedly uplifting exploration of female solidarity under fire. The pleasure of watching it lies not only in the suspense, but in the extraordinary craftsmanship and the commanding performances at its core.

Snook’s portrayal is fierce, harrowing, and ultimately unforgettable. If this series is any indication, her post-Succession era is off to a spectacular—and chilling—start.