Key points
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All Her Fault resolves the Milo kidnapping with revelations about a baby switch and Peter Irvine’s crimes.
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Carrie (Josephine Murphy) kidnaps Milo believing he is her lost son; Milo is ultimately returned alive.
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The finale exposes Peter’s actions and ends with his death and the case quietly closed.
All Her Fault closes its eight-episode run with a series of reveals that tie a missing-child mystery to a long-buried car crash and family lies. The Peacock thriller shows how a single panic can unspool reputations, marriages, and lives. Here’s a clear, scene-by-scene breakdown of the ending who kidnapped Milo, why, what’s revealed about Peter, and how the series wraps the investigation.
Why does Carrie kidnap Milo in All Her Fault?
Early in the series it becomes clear that Carrie the nanny hired under the name Carrie Finch but actually Josephine “Josie” Murphy abducts Milo deliberately. Carrie’s motive is rooted in a traumatic past: as a teenager she lost a newborn in a car crash and has believed ever since that her child did not survive. Carrie becomes convinced Milo is her son after seeing him and being struck by similarities. To get close to him she invents a false identity, takes a job in the family’s orbit, and engineers opportunities to be near Milo. When the opportunity arises to pick him up from school, she seizes it.
Carrie’s plan is methodical: she arranges contacts, recruits an ex-boyfriend (Kyle) and enlists her father Rob, who has criminal ties, to help. The abduction is not a random act of violence; it’s an intended retrieval rooted in grief and the belief that Milo is the child she once lost.
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Is Milo really Carrie’s son in All Her Fault?
Yes. The show ties the kidnapping motive to a concrete biological connection. Flashbacks and investigative work reveal that Marissa, Peter, and Carrie were involved in the same car crash years earlier. Both Marissa and Carrie gave birth around the same time. After the wreck, while both women were unconscious, Peter learned that one newborn had died. Under the assumption that Carrie had perished, Peter swapped the babies taking the living infant and placing him with Marissa while letting Carrie’s family believe her child had died. That swap is the central secret the series exposes: Milo is biologically Carrie’s son.
Detective Alcaras, working the case, identifies synesthesia a sensory condition carried by both Carrie and Milo as an inherited clue. This rare trait helps corroborate the biological link. The series treats the revelation as factual within its narrative: Milo’s parentage is not an accusation but a discovered truth.
READ MORE: The True Story Behind Peacock’s All Her Fault
What happens to Milo is he returned safely?
Milo is returned alive. After Carrie takes him, she keeps him hidden first at a lake house, then at a motel and tries to introduce him to people she believes are part of his life, including a man she identifies as his biological father. Her plan unravels: Kyle is killed by Rob (his father) after being identified on surveillance footage, leaving Carrie exposed. Later, in a chaotic ransom attempt, Peter murders Rob to prevent exposure and then places Milo where police will find him the trunk of a car near a police station ensuring his child is recovered.
Law enforcement recovers Milo unharmed and he is reunited with Marissa. The physical safety of the child is restored before the final revelations about the adults’ past actions come fully to light. The series is careful to show Milo’s return as the endpoint of the immediate crisis while acknowledging the deeper consequences that follow for the adults involved.
After Milo is returned, Carrie goes to the Irvine family home with the intention not to kidnap again but to reveal her identity and warn Marissa about Peter. During the confrontation, Colin Dobbs attempts to disarm her and is accidentally killed in the struggle. Carrie then claims she came to explain and to play a recording that would expose Peter, but she is shot and killed during the scuffle. Peter says the shooting was in self-defense; Carrie dies before she can fully present the evidence she has collected.
Her death stops her direct testimony, but the recording and subsequent investigation reveal fragments of what she intended to say. Carrie’s arc ends in tragedy: she regains her identity as Josephine Murphy but is killed before the entire truth can be publicly aired.
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How does Peter’s wrongdoing come to light in All Her Fault?
Peter Irvine’s actions are exposed in stages. The initial shock of Milo’s disappearance prompts investigators and journalists to scrutinize the family. As Detective Alcaras and others dig, they uncover inconsistencies tied to the old car crash and to the Irvine family’s history. Carrie’s recordings and the fragments she leaves behind link back to the crash and to Peter’s choices in its aftermath.
The key revelation is that Peter swapped the newborns after the wreck. He placed the living baby with Marissa while allowing Carrie’s family to believe their child had died. That act is compounded by later crimes: Peter murders Rob Murphy — Carrie’s father — during a ransom attempt, and he has a history of manipulation and control within his family. Those discoveries dismantle Peter’s outward image as a supportive husband and reveal the possessive, violent behavior beneath.
Peter dies after Marissa engineers a situation at Colin’s funeral that triggers his known severe allergy. She kisses him while having eaten something containing the allergen an action that leads to him suffering a catastrophic allergic reaction. Peter searches for an EpiPen that turns out to be expired and emergency help is delayed; a flashback sequence confirms Marissa planned key elements of the set-up, including the placement and disabling of emergency supplies.
Peter’s death is ruled in a way that allows authorities to close the case. Detective Alcaras later acknowledges that he understands the facts including the synesthesia link and Peter’s culpability and indicates to Marissa that he’s “fine” with the matter being closed. Lia, Peter’s sister, covers for Marissa at the funeral, implying the incident was accidental. The series leaves the legal consequences largely resolved off-screen: Peter dies, and the official investigation does not proceed to a full public prosecution.
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How does the series end emotionally for Marissa and Jenny?
The final scenes center on quiet recovery rather than courtroom drama. With Milo back and Peter dead, Marissa and Jenny share a moment of calm while their sons play together. The pair’s friendship forged in crisis remains an emotional anchor. The series closes on a note that acknowledges the cost of the revelations: relationships damaged, lives lost, and reputations forever altered. Still, it allows its central characters a measure of peace after a harrowing ordeal.
Where and when did All Her Fault premiere? Streaming details
All Her Fault premiered on November 6, 2025, on Peacock in the United States and is available through NOW TV in select regions. The series runs eight episodes and adapts Andrea Mara’s 2021 novel of the same name.
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