All Her Fault cast and character guide
All Her Fault is already making waves on Peacock. This gripping mystery-drama, adapted from Andrea Mara's novel, premiered on November 6, 2025. The story plunges viewers into a tense narrative where Marissa Irvine discovers that her son Milo has suddenly gone missing following an ordinary playdate.
The series gives every actor a moment to shine while unraveling hidden secrets, testing relationships, and revealing harsh truths about the people parents trust with their children.
Main plot and characters
The focus is on the Irvine family—Marissa and Peter—and an ensemble of interconnected characters whose lives unexpectedly intersect. Detective Alcaras leads the investigation into Milo's disappearance, probing not only the Irvines but also the school mothers and nannies involved in Milo's life.
Through these characters, All Her Fault explores how ordinary individuals confront extraordinary situations.
Key cast and performances
- Marissa Irvine – a corporate mother residing in Chicago, portrayed by Sarah Snook.
Sarah Snook, an Emmy-winning actress known for her role as Shiv Roy in Succession, delivers a powerful performance as Marissa. Born in Adelaide, Australia, Snook’s career includes notable films like Predestination (2014), Pieces of a Woman (2020), and Run Rabbit Run (2021).
The cast’s subtle and compelling acting breathes life into the suspenseful storyline, making each plot twist captivating and unpredictable.
Summary
All Her Fault combines talented performances with a suspenseful plot, exploring the challenges ordinary people face when confronted with an unimaginable crisis.
Author's summary
This series skillfully intertwines mystery and emotional depth, showcasing how trust and secrets unravel in the pursuit of the truth.