A mother goes to collect her four-year-old from a playdate and finds a stranger at the door: the address was fake, and so was the nanny who took him.
A fast, twisty Dublin thriller about school-gate pressure, class and blame, with a final reveal that reframes everything. The cast is sharp and the pace is relentless, though some of the coincidences stretch belief and the dark middle is not for everyone. Four out of five. Content note: a kidnapped child, the death of a baby and several murders.
Every guide comes as a video and a full written article. Pick the one you need: the review is spoiler-free, the ending explained is not.
All Her Fault book summary: the fake playdate, seven days missing, the suspects, the bodies and the final secret, in the order the novel tells it. Full spoilers for Andrea Mara's thriller.
All Her Fault ending explained: who took Milo, why Carrie did it, the baby swap after the crash, how Marissa works out the truth and what happens to Peter. Full spoilers for Andrea Mara's novel.
All Her Fault book versus show: Dublin becomes Chicago, Jenny's marriage and the police change, and Carrie, Colin and Peter die differently. Plus a word on author Andrea Mara. Series facts are reported, as of October 2026. Spoilers for both.
All Her Fault (2021) is a psychological thriller by the Irish author Andrea Mara. On a Friday in November, Marissa Irvine goes to pick up her four-year-old son, Milo, from a playdate and finds that the address is wrong, the text was faked and her son has gone off with a nanny called Carrie. The story is told in turn by Marissa, by Jenny, the nanny’s employer, by Carrie’s mother Irene, and by Carrie herself.
Content note: the book deals with a kidnapped child, the death of a baby, murders, violence and online abuse.
Below you’ll find a spoiler-free review, the book summary and ending explained, and a comparison with the Peacock series.
A fast, twisty Dublin thriller about school-gate pressure, class and blame, with a final reveal that reframes everything. The cast is sharp and the pace is relentless, though some of the coincidences stretch belief and the dark middle is not for everyone. Four out of five. Content note: a kidnapped child, the death of a baby and several murders. Read it if: you like fast, twisty domestic thrillers and missing-child mysteries; you enjoy school-gate satire and sharp family dynamics; you want a dublin setting and several unreliable narrators; you watched the peacock series and want the original, irish story. Skip it if: a kidnapped four-year-old, a baby's death and murder are too much right now; you want a quiet, slow-burn mystery; you dislike a tangle of coincidences in your plots; you need every character to be likeable.
Our ending explained covers the final chapters in full, with spoilers. All Her Fault ending explained: who took Milo, why Carrie did it, the baby swap after the crash, how Marissa works out the truth and what happens to Peter. Full spoilers for Andrea Mara's novel. Ending explained: All Her Fault →
All Her Fault book summary: the fake playdate, seven days missing, the suspects, the bodies and the final secret, in the order the novel tells it. Full spoilers for Andrea Mara's thriller. Summary: All Her Fault →
Marissa Irvine arrives to collect her four-year-old son, Milo, from a playdate and discovers the address and the invitation were fake. The nanny of another child in his class has taken him, and the investigation reveals a long plan, a family secret and a string of deaths.
Andrea Mara, an Irish author and former financial services worker who also runs the parenting blog OfficeMum.ie. The novel was first published in 2021 by Bantam Press.
Yes. A limited series based on the novel premiered on Peacock in November 2025 (reported), with Sarah Snook as Marissa and Dakota Fanning as Jenny. As of October 2026 it is reported to run for eight episodes.
The book is set in Kerryglen, a wealthy Dublin suburb, in November 2018, with scenes in Sandymount, Killiney Hill, Dun Laoghaire and Marbella. The TV series moves the story to a Chicago suburb.
No. It is a work of fiction, and the author's note says any resemblance to real people is coincidental.
