Can't believe it! All Her Fault is already the talk of the town on Peacock! This thrilling mystery-drama, adapted from the novel by Andrea Mara, was released on November 6, 2025, and throws viewers into a nerve-wracking tale where Marissa Irvine realizes that her boy Milo has just vanished after a normal playdate.Not only does every actor in All Her Fault get their time to shine, but also, during the process, secrets are uncovered, relationships are put to the test, and parents get harsh realities about the people they trust with their kids.The plot centers on the family of Marissa and Peter Irvine, along with other characters whose lives cross in surprising ways. Detective Alcaras, the police investigator, investigates the lives of Marissa and Peter, the school mothers and nannies who are in Milo's life, and are included in All Her Fault's exploration of how common people face very unusual situations.The actors are the ones who give life to this tense scenario with their impressive talent and subtlety, thus making every twist in All Her Fault engrossing and unpredictable.Let's take a look at the All Her Fault cast and character guideSarah Snook as Marissa IrvineMarissa Irvine, a corporate mom living in Chicago, is the terrified parent of the Emmy-winning actress Sarah Snook, who was awarded the prize for her outstanding acting performance and who played Shiv Roy in Succession.Snook was born in Adelaide, Australia, and later starred in films such as Predestination (2014), Pieces of a Woman (2020), Run Rabbit Run (2021), etc. Besides, Sarah has succeeded in the film industry and being a part of the theater that she got praised for her acting in Saint Joan and The Picture of Dorian Gray.In All Her Fault, she plays an anxious mother, keeping secrets and getting involved in messy loves, and she is one of the leading characters in this drama.Jake Lacy as Peter IrvineJake Lacy is the one to characterize Peter Irvine, Marissa’s husband and Milo’s father. Lacy has formed a career based on diverse family dramas, such as Apples Never Fall, A Friend of the Family, The White Lotus Season 1, and The Office.In All Her Fault, he is the one who shows the fatherly side of the crisis, thus responding to the disappearance of his son while at the same time his own past and character traits are unfolding.Dakota Fanning as JennyDakota Fanning is the one who brings Jenny to life, a mother who has a connection with Marissa because of their kids. Fanning took on roles and came into the limelight with I Am Sam, Uptown Girls, and The Secret Life of Bees, among others. Her recent projects are Ripley and The Perfect Couple.In All Her Fault, the character of Jenny proves to be essential to the playdate mystery through which the events of the series are unleashed.Michael Peña as Detective AlcarasMichael Peña plays the role of Detective Alcaras, who is the one responsible for searching for Milo. Peña’s career began in the mid-1990s and included such films as Million Dollar Baby, Crash, Babel, Ant-Man, Narcos: Mexico, and Jack Ryan.In All Her Fault, his persona is the one who leads the procedural investigation, helping the viewer to understand the facts, clues, and even the rising tension.Sophia Lillis as Carrie FinchLillis is delivering the proficient Carrie Finch, the nanny or the assistant who has ties with the Irvines and the vanishing of Milo, to the stage. No one else but Sophia Lillis caught the casting director's eye when she portrayed the little girl, Beverly Marsh, in It (2017/2019), and soon after that conquered the screen in Sharp Objects, Nancy Drew and the Hidden Staircase, and I Am Not Okay With This.Marissa's character in All Her Fault adds the murkiness and delicate touch as her relationship with Marissa overlaps in very significant ways.Abby Elliott as Lia IrvineAbby Elliott is seen in the role of Lia, Peter's sister. Elliott's professional life has been marked by milestone creations, including Saturday Night Live (2008-2012), Odd Mom Out, and The Bear.Lia in All Her Fault is one of the extended Irvine family members whose relationships are severely strained due to Milo's vanishing act.Jay Ellis as ColinJay Ellis is in the role of Colin, who is a close friend and also a Marissa’s workmate. Ellis is associated with The Game, Insecure, and Top Gun: Maverick. His role in All Her Fault reflects the larger social circle that is caught up in the central mystery.Daniel Monks as Brian IrvineDaniel Monks plays Brian, one of the siblings in the Irvine family. Monks is an actor and writer from Australia, known for his roles in Pulse and KAOS.He is part of the family in All Her Fault that is coming to terms with Milo’s disappearance.Duke McCloud as Milo IrvineThe character of Milo, the little boy whose disappearance is the main plot of All Her Fault, is portrayed by Duke McCloud.He made his on-screen debut in 2025 in the Amy Schumer comedy Kinda Pregnant and was only 4 years old at the time of shoot.Supporting characters View this post on Instagram Instagram PostCharacters that are additional come to life in drama, or rather, All Her Fault:Ana, a caregiver involved in the playdate network, is played by Kartiah Vergara.Richie is played by Thomas Cocquerel, who is connected to the family through the social network.No one can be considered insignificant because every character contributes to the development of the plot by being either part of Marissa and Peter’s primary family, the kid care circle, or the inquiry into the missing child.Setting and adaptationMegan Gallagher adapted All Her Fault for television. The show still differs a bit from Andrea Mara’s novel by changing the setting from Dublin to Chicago, but the major plot points are unaffected. The eight-episode series on Peacock examines family relations, trust, and the aftermath of a child’s disappearance.Every single character plays an important part in revealing what really happened; thus, the Peacock series becomes a thrilling watch for all genre fans. For the latest on All Her Fault, including cast changes, previews of the episodes, and insights from the set, be sure to follow Soap Central so you can be updated with all the exciting and latest happenings!Also read: All Her Fault: Release date news, cast details, streaming details and more about the upcoming Peacock mystery thriller