All Her Fault Ending Explained: Unpacking the Shocking Final Twists

The Peacock thriller “All Her Fault” concluded with a stunning finale. The series starring Sarah Snook revealed a web of murder and deception. Viewers were left reeling from four major plot twists.

The ending saw Marissa Irvine take control of her life in a drastic way. She discovered her husband Peter was a murderer and a liar. Her final act changed everything for her and her son, Milo.

How the Baby Swap Secret Was Revealed

The finale’s central mystery involved a car accident from six years prior. Peter confessed he switched babies after the crash. His own newborn died, but another woman’s child survived.

That woman was Josephine Murphy, known as Carrie. Peter took her living son and raised him as Milo. He told Marissa their child had survived the wreck. This lie formed the foundation of their family life.

Carrie discovered the truth through a shared condition. Both she and Milo experience synesthesia. This neurological connection made her realize Milo was her biological son.

Marissa’s Calculated Revenge Against Peter

Marissa learned Peter had killed to protect his secret. He murdered Carrie’s father and then shot Carrie herself. These were cold-blooded acts of self-preservation.

Faced with this reality, Marissa made a brutal choice. She decided Peter could not be allowed to live. She needed to protect Milo from further trauma.

Her method was chillingly precise. She exploited Peter’s severe soy allergy at a funeral. She replaced his emergency EpiPen with an expired one. Then she deliberately triggered his allergic reaction.

The Moral Compromise of Detective Alcaras

Michael Peña’s Detective Alcaras solved the case eventually. He uncovered evidence that Marissa murdered her husband. But he made a surprising decision regarding justice.

Alcaras chose not to arrest Marissa for her crime. He understood her motivation to protect her son. The detective had his own complicated history with family protection.

This conclusion shows the series’ moral complexity. Sometimes the legal system cannot deliver true justice. Alcaras allowed a murderer to walk free for what he saw as the greater good.

Creating a New Family After the Chaos

The final scene shows Marissa and Jenny watching their sons play. They have formed an unconventional family unit. Both women have found peace after tremendous suffering.

This ending differs significantly from Andrea Mara’s original novel. The television adaptation made Marissa more actively involved in Peter’s death. According to Variety, this change gave the character more agency.

Sarah Snook’s performance anchors these dramatic twists. She portrays Marissa’s transformation from victim to calculated survivor. The series concludes with her finally controlling her own narrative.

The “All Her Fault” ending provides shocking closure to a twisted tale of motherhood and murder, proving that sometimes the most dangerous secrets are hiding in plain sight.

Thought you’d like to know

What was the baby swap in All Her Fault?

Peter switched babies after a fatal car accident six years earlier. His biological son died in the crash, but another woman’s baby survived. He took the living child and raised him as Milo, concealing the truth from everyone.

Why did Marissa kill Peter?

Marissa killed Peter after learning he was a murderer who had stolen another woman’s child. She believed this was the only way to protect Milo from further harm and ensure their freedom from his dangerous lies.

Did Detective Alcaras know Marissa killed Peter?

Yes, Detective Alcaras discovered evidence proving Marissa murdered Peter. He consciously chose not to arrest her, understanding her motives and believing Peter’s crimes justified her actions in this unique circumstance.

Is All Her Fault based on a book?

Yes, the series adapts Andrea Mara’s 2021 novel of the same name. The television version made significant changes to the ending, particularly making Marissa more directly responsible for Peter’s death.

Will there be a season 2 of All Her Fault?

No, All Her Fault was conceived as a limited series with a complete story arc. The finale provides closure for all major characters, making a second season unlikely according to current reports from entertainment sources.

Where can I watch All Her Fault?

All Her Fault streams exclusively on Peacock in the United States. International viewers can access it through various platforms including BINGE in Australia and TVNZ+ in New Zealand, with all eight episodes available.