Sam reveals he is a prolific serial killer who is desperate to stop his violent compulsions.

A veteran therapist who must use every clinical tool in his arsenal to stay alive while being held captive.

Sam’s mother, who lives in the house and is aware of the kidnapping but is paralyzed by her own guilt and fear.

Alan's late wife, appearing in flashbacks and dreams as he searches for a reason to keep fighting.

As the series progresses on Hulu, the relationship between doctor and patient becomes increasingly claustrophobic and treacherous.

A restaurant inspector with a love for ethnic food and a history of childhood abuse that fuels his rage.