Peacock's psychological thriller All Her Fault wrapped its eight-episode first season with shocking revelations that turned everything viewers thought they knew upside down. The limited series, based on Andrea Mara's best-selling novel, stars Sarah Snook as Marissa Irvine, a mother whose life implodes when her five-year-old son Milo vanishes during what was supposed to be his first playdate.
But the truth behind Milo's disappearance proved far more twisted than a simple kidnapping. By the finale, family secrets dating back years were dragged into the light, multiple people were dead, and the very foundation of the Irvine family had crumbled. Here's everything you need to know about how All Her Fault ended — and what those final moments really mean.
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Milo's kidnapping sets the entire series in motion. When Marissa arrives to collect him from the home of Jenny (Dakota Fanning), she discovers that Jenny never arranged any playdate— and that her son has vanished.
The truth unfolds in the finale: We discover that Carrie—the nanny Jenny hired to care for her children—orchestrated the abduction. Carrie (played by Sophia Lillis) grabbed Milo directly from his school and she didn't work alone. Her criminal ex-boyfriend Kyle and her father Rob were also both involved in the kidnapping scheme.
Milo is eventually rescued when his father Peter (Jake Lacy) figures out where the kidnappers are hiding. He confronts them at a motel with the bag of ransom money. While Rob is counting the cash and distracted, Peter kills him with a lamp. Peter then finds Milo hidden in a closet, stashes him in a car trunk, and leaves him at the police station, making it look like the kidnappers returned the boy themselves.
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Why Did Carrie Take Milo?
The motive behind Milo's kidnapping is the series' biggest twist. Carrie isn't Carrie Finch at all — her real name is Josephine "Josie" Murphy. Six years before the events of the show, she was involved in a devastating car crash with Peter and Marissa that killed her newborn baby. Or so everyone believed.
In the finale, Josie appears at the Irvines' home with a gun. She says she's not there to harm anyone and just wants Marissa to know the truth about her husband, before accidentally shooting and killing Marissa's friend Colin (Jay Ellis).
The truth is, it wasn't Josie's baby who died in that accident — it was Marissa and Peter's. According to Josie, Peter switched the babies at the crash scene and took her child. The boy we know as Milo is actually her biological son.
During the confrontation, Peter wrestles Josie for the gun and kills her, then confesses everything to Marissa. He admits that Milo isn't their biological child and that Josie was telling the truth. He did, in fact, swap the babies as she claimed. Peter says he believed Josie was already dead at the scene. And when he realized their son had died in the crash, he wanted to protect Marissa from the pain of losing their child.
Jake Lacy explained his character's mindset to the The Hollywood Reporter: "I think he believes wholeheartedly he was in shock and that he could prevent Marissa from having to grieve the loss of a child, their child, by making this swap, that it's a weight he would carry privately so she didn't have to."
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Beyond the baby swap, the series reveals that Peter has been covering up dark secrets for decades. He's responsible for multiple deaths—not just the two people he killed during Milo's kidnapping—and viewers also learn he caused the accident that left his brother Brian (Daniel Monks) disabled. Peter tripped Brian and then let his sister Lia (Abby Elliott) take the blame.
Lacy toldThe Hollywood Reporter that Peter's core trait is fear: "I think Peter is, at the end of the day, petrified, filled with fear and self loathing and any of these things that poke at his fallibility or his weaknesses are unbearable for him and that that's hardwired in." He added that Peter sees himself as a "white knight in his own mind" who refuses to acknowledge his own culpability in anything.
"Peter really believes his lies, there's a lot of justification and he believes it wholesale," Lacy said in an interview withEntertainment Weekly. "He has no shame. He's like, 'I did the right thing. If you disagree with me, it's not even a matter of perspective. You're incorrect. I've done the right thing here.'"
How Does Peter Die?
Despite everything Peter has done—the lies, the murders, the stolen child—Marissa doesn't turn him in. If she does, she might lose Milo forever, as revealing the truth about Peter would also reveal that Milo’s not legally her son.
But Marissa doesn't let Peter off the hook either. At Colin's funeral service, Peter goes into anaphylactic shock. Marissa had kissed him after eating something with soy in it, and he’s deathly allergic. Peter frantically searches for his EpiPen, but it's expired. The emergency medical kit normally kept in their car is also mysteriously missing. By the time help arrives, it's too late—Peter dies.
The show then flashes back to reveal that Marissa deliberately removed the medical kit from their vehicle and replaced Peter's working EpiPen with an expired one.
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By the end of the series, Detective Alcaras (Michael Peña)—who's been investigating Milo's case from the beginning—has pieced together the truth. He notices a crucial detail: Both Milo and Carrie/Josie experience synesthesia, a rare neurological condition where the senses overlap. This genetic link confirms that Carrie/Josie was telling the truth about being Milo's biological mother.
In one of the final scenes, Alcaras meets with Marissa and reveals that he knows the truth about everything. But then he tells her he's closing the case. Alcaras seems to understand that exposing all of the facts would only cause more pain — particularly for Milo, an innocent child caught in circumstances beyond his control.
How Does 'All Her Fault' End?
The series concludes with Marissa and Jenny sitting together, sharing wine while they watch their sons play in the yard. It's a quiet, peaceful moment after all the chaos and violence that preceded it.
Whether Marissa can truly live with what she's done remains an open question.
All Her Fault takes significant liberties with its source material, particularly in later episodes. In a conversation with Collider, showrunner Megan Gallagher discussed the challenge of adapting the novel.
Episode 5 was particularly hard to write, she said, because "at that point we had deviated entirely from the book and this was material that wasn't in the book." Gallagher continued, "So, it's nerve-wracking for that reason. It's also nerve-wracking because, as I mentioned, it's basically a chamber play... I didn't have the safety of the book."
Despite the pressure, she's proud of how it turned out. "To this day, I'm just so grateful that Peacock let me do that," she said. "Peacock was like, 'Go do your thing.' And I was like, 'Are you sure?' But they let me do it, so I'm very deeply proud of that episode."
Will There Be a Season 2 of 'All Her Fault'?
When asked about the possibility of continuing the story, Gallagher told Collider she'd be open to it. "Wouldn't that be nice? I would be up for that," she said. Whether a potential second season would continue following Marissa and Milo or take an anthology approach featuring new characters is still unknown. Gallagher added that, for now, “we're excited for everybody to dive into season one."
All eight episodes of "All Her Fault" are currently streaming on Peacock.
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