All Her Fault episodes spark outrage as Sarah Snook’s twist ending shocks Peacock viewers

All Her Fault premiered on Peacock on November 6, 2025 with all 8 episodes available. The limited series stars Sarah Snook as a mother confronting devastating secrets. Her shocking twist ending has left viewers stunned and outraged. The finale reveals shocking truths about murder, deception, and parental obsession.

What Happened: A Child Goes Missing, Then Everything Unravels

Marissa Irvine goes to pick up her 5-year-old son Milo from a playdate. He isn’t there. Jenny Kaminski, the other mother, insists the visit never happened. Panic spreads throughout Chicago as authorities launch an investigation. The police discover that Carrie Finch, Jenny’s nanny, picked up Milo from school.

Carrie isn’t who she claims to be. Her real name is Josephine Murphy. She reveals a shocking truth to the Irvines: she was in a car accident with them 6 years earlier. Marissa was unconscious during that fateful night. Peter, her husband, made a horrifying decision at that moment. He switched his dead newborn with Josephine’s living baby.

“Years of buried lies have unraveled by the time Carrie Finch shakily raises a gun at the Irvine family in the finale.”

Peter admits he believed Josephine was dead. He thought the baby needed a home. His justifications crumble as Marissa realizes she married a manipulator. Peter then shoots Josephine to silence her. The truth emerges: Peter also killed Josephine’s father at the motel. He had grabbed a lamp and struck him fatally.

Why Viewers Are Shocked: The Series Questions Everything About Love

The finale doesn’t offer easy answers. Instead, it forces viewers to confront uncomfortable moral questions. Marissa discovers her entire marriage was built on lies. The son she loved for 5 years isn’t biologically hers. Her husband is a cold-blooded killer. She faces an impossible choice: expose Peter or protect Milo.

The series examines what happens when parental love becomes obsession. Peter switched babies to control his own narrative. Marissa chooses to murder her husband to protect their son. Neither character is purely villain or victim. Creator Meghan Gallagher deliberately builds sympathetic characters who make terrible decisions. The show challenges viewers’ assumptions about justice and motherhood.

Many fans express outrage at the moral ambiguity. Some argue the ending glorifies violence. Others praise the series for refusing simple resolutions. The twist ending sparks heated debates on social media. “All Her Fault” forces viewers to examine their own values about family and truth.

The Details: How Marissa Gets Away With Murder

Detective Alcaras starts investigating Peter’s suspicious death from anaphylaxis. He discovers an audio recording on a phone. The recording captures Peter murdering Josephine’s father. Alcaras realizes Marissa deliberately poisoned Peter.

Character	Role in Finale	Fate
Marissa Irvine	Mother seeking protection for son	Goes free unpunished
Peter Irvine	Reveals himself as murderer	Dies from soy-induced anaphylaxis
Josephine/Carrie	Seeks truth about missing son	Shot dead by Peter
Detective Alcaras	Investigates Peter’s death	Chooses to ignore evidence

Alcaras confronts Marissa privately to explain his findings. He tells her he knows Peter murdered Rob. He knows Marissa poisoned Peter to protect Milo. Then Alcaras makes a decision: he will not pursue charges. He recognizes that Marissa acted out of desperate love. Peter was destroying everything around him.

Alcaras admits he has made morally questionable choices for his own son. He prioritizes Milo’s stability over legal accountability. The detective essentially tells Marissa that justice has been served. Peter controlled through lies and violence. Now he cannot hurt anyone else.

What To Watch For: A Friendship Forged in Crisis

The finale’s closing moments reveal surprising emotional depth beyond the thriller plot.

• Marissa and Jenny form a powerful bond based on shared trauma.
• Both women have eliminated toxic husbands from their lives.
• The final scene shows them drinking wine on a porch together.
• Their sons play peacefully in the yard below.
• Sarah Snook calls this moment “pleasingly matriarchal.”

The ending emphasizes female solidarity over traditional justice. Marissa and Jenny create new family structures free from male control. They move beyond victimhood into active agency. The series suggests that sometimes the most powerful act is reclaiming your narrative. The men who sought to control them are gone. The women survive with their children intact.

Is “All Her Fault” Really About Justice or Empowerment?

Creator Megan Gallagher deliberately constructed a story without standard moral clarity. Marissa’s murder isn’t presented as righteous vengeance. Instead, it’s portrayed as tragic necessity. She destroys the man she loves to save her son. The cost is enormous and irreversible.

The series makes viewers complicit in overlooking murder. Alcaras represents all of us who might look away. We prioritize protecting innocent children over abstract legal principles. Gallagher argues that right and wrong differ from law. She refuses to condemn Marissa for choosing motherhood over morality.

Sarah Snook describes the ending as “Greek tragedy.” Marissa becomes a tragic heroine who commits the unthinkable. She acts not from malice but from love pushed past breaking point. The show asks: What would you do? Would you choose your child over justice? Would you forgive a mother who did? Watch all 8 episodes now on Peacock to form your own answer.

Sources

• Variety – “‘All Her Fault’ Twist Ending: Sarah Snook on Why Marissa Kills Peter”
• TIME Magazine – “Breaking Down the Devastating Ending of All Her Fault”
• Peacock – Official series information and streaming details