Cast of The Sinner

Harry Ambrose is a police detective who delves into the complex motivations behind crimes committed by unexpected perpetrators.

Cora Tannetti becomes a central figure in the first season after committing a shocking act of violence.

Mason Tannetti is Cora Tannetti's husband who is drawn into the complexities of her criminal case.

Caitlin Sullivan is a dedicated police officer working alongside Harry Ambrose.

Stephanie Lam is connected to a local community implicated in one of the seasons' stories.

Sonya Barzel is a painter who becomes embroiled in a criminal investigation.

Dan Leroy is a colleague of Harry Ambrose in law enforcement.