Part IV (Season 1)

"Part IV" is the fourth episode of the first season of The Sinner. It is the fourth episode of the series overall. It premiered on August 23, 2017. It was written by Liz W. Garcia and directed by Brad Anderson.

Synopsis
Cora's memories begin to emerge under hypnosis, sending her to a dark place. Mason takes matters into his own hands.

Cast

 * Bill Pullman as Detective Harry Ambrose
 * Jessica Biel as Cora Tannetti
 * Christopher Abbott as Mason Tannetti
 * Dohn Norwood as Detective Dan Leroy
 * Abby Miller as Sergeant Caitlin Sullivan