All Her Fault Cast: Sarah Snook, Michael Peña & Full List

Sarah Snook traded Shiv Roy’s boardroom wars for a very different kind of pressure on November 6, 2025, when Peacock dropped its eight-episode thriller All Her Fault. She leads a cast that includes Michael Peña, Dakota Fanning, and Jake Lacy — actors who collectively bring credits from Ant-Man, White Lotus, and Succession into one tight, tense ensemble. This guide runs through every confirmed casting choice, what the show is based on, where it was filmed, and whether it’s worth your streaming queue.

Lead Actress: Sarah Snook as Marissa Irvine ·
Detective Role: Michael Peña as Detective Alcaras ·
Supporting Star: Dakota Fanning as Jenny Kaminski ·
Key Cast: Jake Lacy as Peter Irvine ·
Release Platform: Peacock (2025)

Who is in the All Her Fault cast?

The season 1 ensemble pulls from a mix of prestige-TV veterans and rising talents, anchored by Snook’s dual role as star and executive producer.

Sarah Snook as Marissa Irvine

Snook earned global recognition playing Shiv Connor in Succession. Here she portrays Marissa Irvine, a mother whose ordinary errand — picking up her son Milo from a playdate — becomes the opening move in a mystery when a woman at the door denies knowing the child at all. She also serves as executive producer on the series Peacock TV (official platform).

Michael Peña as Detective Alcaras

Peña brings his signature blend of intensity and dry humor from Narc and the Marvel universe into the investigative lead. He plays Detective Alcaras, partnered with Detective Greco (Johnny Carr). Note that some secondary sources occasionally reference the character as “Detective McConville” — Wikipedia and the official Peacock listing both confirm Alcaras as the canon name Talk Teav (filming details).

Dakota Fanning as Jenny Kaminski

Fanning, recently seen in The Watchers, takes on the role of Jenny Kaminski alongside her real-life brother Duke McCloud, who plays young Milo Irvine, age 5 in the story. The sibling pairing adds an intimate dynamic to the show’s central family tensions. Both actors were confirmed cast on July 24, 2024 Wikipedia (cast timeline).

Jake Lacy as Peter Irvine

Lacy, a White Lotus alum, plays Peter Irvine, Marissa’s husband. His casting was announced the same day as Fanning’s, anchoring the family triangle at the heart of the mystery. Abby Elliott rounds out the Irvine family as Lia, Peter’s sister.

The full ensemble

Beyond the headline names, the cast includes Sophia Lillis as the nanny Josephine “Josie” Murphy (also going by Carrie Finch in the series), Jay Ellis as Colin Dobbs (Marissa’s best friend and business partner), Thomas Cocquerel as Richie Kaminski, and Daniel Monks as Brian Irvine TV Guide (full cast list).

Megan Gallagher created the series and serves as writer and executive producer, while Minkie Spiro directed episodes 1 through 4 and Kate Dennis took episodes 5 through 8 Peacock TV (directors). Andrea Mara, whose 2021 novel inspired the adaptation, appears as associate producer.

Was All Her Fault a true story?

The series is not based on a specific real-world case. It adapts Andrea Mara’s 2021 novel of the same name, which draws from general disappearance tropes rather than any documented crime.

One notable fan theory drew loose connections to the unresolved Emanuela Orlandi case or Mary Louise Day, but these links have no foundation in interviews or official materials. The show’s creator and author have not cited either case as inspiration Wikipedia (origins).

There is one major adaptation shift worth noting: the novel is set in Dublin, but the series relocates the action to the Chicago suburbs Talk Teav (adaptation changes). The gender of the detective was also swapped — in the book the detective is female, while Michael Peña’s character is male in the series.

The implication: viewers looking for a true-crime parallel should temper expectations. All Her Fault is a fictional thriller that uses real anxieties around parental safety rather than recounting a specific event.

Is All Her Fault worth watching?

For fans of tight-cast thrillers, the answer leans yes. The series earned two nominations at the 83rd Golden Globe Awards — Best Limited Series and Best Actress in a Miniseries for Sarah Snook Wikipedia (reception). Early reviews praised both Snook and Fanning for bringing nuance to roles that could have easily flattened into trope.

The show runs eight episodes with a release structure that dropped the first four on premiere day, followed by two episodes weekly Talk Teav (schedule). That pacing rewards binge watchers but also gives the mystery room to breathe.

What this means: if you enjoyed the ensemble tension of Succession or the slow-burn dread of White Lotus, All Her Fault occupies a similar space. The cast carries the material, and the eight-episode format keeps pacing tight.

Where was All Her Fault filmed?

The series was filmed at Docklands Studios in Melbourne, Australia Talk Teav (production). Despite the Chicago suburbs being the show’s fictional setting, no filming took place in Illinois.

The Chicago location is entirely a production design choice. Interior sets and exterior shots filmed in Melbourne were dressed to suggest an affluent American suburb. Reports that the series was filmed in Chicago were not confirmed by production materials Box Office Hype (location details).

Produced by Carnival Films for Universal International Studios See News (production companies), the show carries the same footprint as other Peacock premium originals.

The catch: the mansion central to the series remains geographically ambiguous in coverage. The production design team has not disclosed whether a real Illinois property was used as a reference or built entirely on set.

What happened in All Her Fault?

The plot centers on Marissa Irvine, who arrives at a house to collect her son Milo from what she believed was a playdate. The woman who answers the door denies any knowledge of the child Peacock TV (official logline). From that single moment, the series spirals outward into questions about identity, memory, and what we think we know about the people closest to us.

Milo, age 5, vanishes into the mystery. Detective Alcaras and his partner Greco begin an investigation that pulls in Marissa’s husband Peter, her business partner Colin, and members of the Kaminski family across the street. Each episode peels back a layer of the Irvine family’s life while the search for Milo intensifies.

The pattern: the show uses a domestic thriller setup — missing child, neighborhood secrets — as a vehicle for character study. Whether it delivers a satisfying resolution depends on how the final episodes handle the investigation’s conclusions.

“One door. One question. Where is Milo?”

— Box Office Hype (promotional tagline)

“All Her Fault became an international sensation for its razor-sharp twists and haunting realism.”

— Box Office Hype (reviewer)

For thriller fans on Peacock, the choice is straightforward: Sarah Snook’s performance alone justifies the watch, and the supporting cast gives the show enough texture to justify the full eight-episode commitment. Viewers expecting a procedural investigation may find the family-drama elements slower than anticipated, but those who value character-driven tension will likely find the pacing earns its payoff.

Related reading: Taraji P. Henson: Net Worth, Son, Movies, Age & Bio · Robert De Niro Movies – Best Films and Filmography

The full ensemble, from Sarah Snook’s Marissa Irvine to Jake Lacy’s Peter, shines in this Peacock thriller, with a where to watch guidewhere to watch guide detailing episodes and streaming access.

Frequently asked questions