Cast of The Sinner

Bill Pullman plays Harry Ambrose, a police detective who investigates complex and unusual cases.

Jessica Biel portrays Cora Tannetti, a young mother who commits a shocking act of violence and struggles to uncover her buried truths.

Christopher Abbott is Mason Tannetti, Cora’s devoted husband who seeks to understand his wife’s sudden violent behavior.

Frances Fisher plays Meg Muldoon, a member of a prominent family with deep roots in the community.

Alice Kremelberg is Percy Muldoon, a central character with a mysterious past.

Abby Miller portrays Caitlin Sullivan, a local police officer assisting in the investigation.

Neal Huff plays Sean Muldoon, a key figure connected to the case being investigated by Detective Ambrose.

Cindy Cheung plays Stephanie Lam, who is associated with the case being investigated.

Ronin Wong portrays Mike Lam, connected to the central investigation.

Jessica Hecht is Sonya Barzel, a significant character who becomes involved in the season's case.

Michael Mosley portrays Colin Muldoon, a member of the Muldoon family central to the investigation.

Dohn Norwood is Dan Leroy, a colleague who works closely with Ambrose on the cases.