Main •
Colin Firth as
Michael Peterson, a novelist and political hopeful in Durham. His finances and personal life become the focus of the investigation and documentary. •
Toni Collette as Kathleen Peterson, his second wife, who was a high-powered
executive and well-liked by her family and community. She has a daughter Caitlin from her first marriage. •
Michael Stuhlbarg as David Rudolf, Michael's lawyer •
Dane DeHaan as Clayton Peterson, Michael Peterson's oldest son from his first marriage. He has his own legal issues and served time in prison. •
Olivia DeJonge as Caitlin Atwater, Kathleen's daughter from her first marriage. She initially supports her stepfather. •
Patrick Schwarzenegger as Todd Peterson, Michael's youngest son from his first marriage •
Sophie Turner as Margaret Ratliff, Michael's adopted daughter, whom he adopted after the deaths of her biological parents •
Odessa Young as Martha Ratliff, Margaret's younger sister, who also was adopted by Michael •
Rosemarie DeWitt as Candace (Hunt) Zamperini, Kathleen's sister •
Tim Guinee as Bill Peterson, Michael's brother •
Parker Posey as Freda Black, a
Durham County prosecutor •
Juliette Binoche as
Sophie Brunet, editor of the French documentary series • Vincent Vermignon as
Jean-Xavier de Lestrade, director of the French documentary
Recurring •
Joel McKinnon Miller as Larry Pollard, a lawyer who is neighbors and friends with the Petersons •
Maria Dizzia as Lori (Hunt) Campbell, Kathleen and Candace's sister • Susan Pourfar as Dr Deborah Radisch •
Justice Leak as Tom Maher • Robert Crayton as Ron Guerette •
Cullen Moss as Jim Hardin, the Durham County District Attorney, whom Michael had regularly criticized in columns about him and his office. • Cory Scott Allen as Art Holland • Morgan Henard as Dennis Rowe, a childhood neighbor and friend of Kathleen and Lori's . He later hooked up with Michael on hid flings • Jason Davis as Fred Atwater, Kathleen's first husband and father to Caitlin • Ryan Lewis as Bruce Campbell, Lori's husband • Hannah Pniewski as Becky, Clayton Peterson's wife • Kevin Sizemore as Mark Zamperini, Candace's husband •
Trini Alvarado as Patricia Sue (Patty) Peterson, Michael's first wife and mother to Todd and Clayton • Daniela Lee as Devon •
Teri Wyble as Sonya Pfeiffer • Frank Feys as Denis Poncet, the producer of the French documentary • Andre Martin as Yves, Jean-Xavier's boom operator • Jean-Luc McMurtry as Gaultier, Sophie's assistant editor • Monika Gossmann as Agnes ==Episodes==