Meghann Fahy plays Charlotte “Charlie” Quinn, and Rose Byrne plays Samantha “Sam” Quinn in Peacock’s The Good Daughter. Charlie is the younger sister who stayed in Pikeville, Georgia, and went into criminal defense. Sam is the older sister who left and built a career in patent law in New York. When a school shooting brings Sam home, the sisters have to work together in the town where they grew up.
This guide covers the series setup and keeps the ending and major reveals under wraps.
The Quinn family cast at a glance
| Character | Actor | Where they fit |
|---|---|---|
| Charlotte “Charlie” Quinn | Meghann Fahy | Younger daughter and a Pikeville defense attorney |
| Samantha “Sam” Quinn | Rose Byrne | Older daughter and a New York patent attorney |
| Rusty Quinn | Brendan Gleeson | The sisters’ father and Charlie’s fellow defense attorney |
| Harriet “Gamma” Quinn | Olivia Williams | The sisters’ mother, Rusty’s wife and a physicist |
| Young Charlie | Drew Cheek | Charlie in the flashbacks |
| Young Sam | Audrey Grace Marshall | Sam in the flashbacks |
| Ben Bernard | Michael Dorman | Charlie’s estranged husband and a lawyer |
| Lenore | Harper Steele | The Quinn law office manager and a longtime family friend |
Meghann Fahy plays Charlie, the sister who stayed
Charlie works in the same law office as her father and often represents young clients. She is at her old school when a shooting occurs, putting her close to the new case before she has a chance to decide how involved she wants to be. She and her husband, Ben, are already separated when the story begins. Peacock’s cast breakdown
One way to read Charlie’s decision to stay is to watch how easily work and family overlap for her. The person she can turn to for advice about a case is also the father with whom she shares a painful history. Sam has spent years with more distance from both.
Rose Byrne plays Sam, the sister who left
Sam is a partner at a New York law firm, where she practices patent law. She left Pikeville after surviving the attack that killed her mother. When Rusty asks her to come back and help Charlie, she returns to a family she has spent much of her adult life apart from.
The sisters have the same profession, but their working lives give them different relationships to Pikeville. Charlie has a reputation there apart from being a Quinn. Sam comes back as an accomplished attorney to a town where many people still know her primarily through her family.
Brendan Gleeson plays Rusty, their father
Rusty is a criminal defense attorney whose willingness to represent unpopular clients divides Pikeville. He and Charlie share an office, so their relationship is part of Charlie’s working day as well as her family life. If you’re watching how the sisters react to him, that day-to-day closeness goes a long way toward explaining why a request from Rusty can land differently with each of them.
Olivia Williams plays Harriet “Gamma” Quinn, their mother
Gamma is Harriet Quinn, Rusty’s wife and both girls’ mother. She is a physicist who encourages her daughters to read, ask questions and take an interest in mathematics. The flashbacks give Williams room to show what life with Gamma was like before the attack. In a family full of lawyers, she is the parent who teaches the girls another way to work through a problem.
Who plays Charlie and Sam in the flashbacks?
Drew Cheek plays young Charlie, and Audrey Grace Marshall plays young Sam. That makes Fahy and Cheek the two actors playing the younger sister, and Byrne and Marshall the two playing the older sister. The switch in actors is a quick visual cue that the series has returned to the Quinns’ past. Peacock’s version puts roughly 20 years between the home invasion and the new case. Karin Slaughter’s novel puts 28 years between them.
Where do Ben and Lenore fit?
Ben Bernard, played by Michael Dorman, is Charlie’s estranged husband. He is a lawyer too, and he remains in the Quinns’ orbit after the separation.
Lenore, played by Harper Steele, runs the law office where Rusty and Charlie work. She has known the family for years and helped look after both girls. When Lenore speaks to the sisters, she brings a history with them that goes well beyond the office.
Where to watch or read The Good Daughter
All six episodes premiered on November 12, 2026, and are streaming on Peacock in the U.S. For more about the adaptation, see our Peacock guide to The Good Daughter. If you’ve finished the novel and want to put the events in order, our Quinn family timeline contains full book spoilers. Watch on Peacock
As an Amazon Associate I earn from qualifying purchases.
Find Karin Slaughter’s The Good Daughter in paperback on Amazon.
Follow us on Instagram and Facebook
Posts
Discover more from Books of Brilliance
Subscribe to get the latest posts sent to your email.
