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The Sinner - Episode Guide

Season 1

Part I

Episode: 1x01 | Airdate: Aug 2, 2017

Part I

A housewife stabs a beachgoer to death, which sparks an investigation and creates confusion in a small town.

Part II

Episode: 1x02 | Airdate: Aug 9, 2017

Part II

Cora tries to block Ambrose's investigation; Mason struggles to come to terms with secrets from Cora's past.

Part III

Episode: 1x03 | Airdate: Aug 16, 2017

Part III

Ambrose uncovers a secret about Cora that changes the course of the investigation; Mason takes matters into his own hands.

Part IV

Episode: 1x04 | Airdate: Aug 23, 2017

Part IV

Cora tries to recover missing memories with Ambrose's help; Ambrose discovers a new suspect.

Part V

Episode: 1x05 | Airdate: Aug 30, 2017

Part V

After the discovery of a body in the woods, more questions arise.

Part VI

Episode: 1x06 | Airdate: Sep 6, 2017

Part VI

When Ambrose begins to waver, Cora convinces him to take a risk for the case.

Part VII

Episode: 1x07 | Airdate: Sep 13, 2017

Part VII

Cora finally remembers the night in question.

Part VIII

Episode: 1x08 | Airdate: Sep 20, 2017

Part VIII

Cora's fate is determined.

Season 2

Part I

Episode: 2x01 | Airdate: Aug 1, 2018

Part I

A troubled detective returns to his hometown to investigate why a young boy would kill his parents.

Part II

Episode: 2x02 | Airdate: Aug 8, 2018

Part II

Ambrose and Heather begin to unravel where Julian is from; Julian is thrust into a new world.

Part III

Episode: 2x03 | Airdate: Aug 15, 2018

Part III

Heather makes a startling realization about Marin; Vera and Julian are dealt a hard blow.

Part IV

Episode: 2x04 | Airdate: Aug 22, 2018

Part IV

Ambrose returns to Mosswood to confront Vera about the commune's work.

Part V

Episode: 2x05 | Airdate: Aug 29, 2018

Part V

As Ambrose zeroes in on a new suspect, a rift develops between him and Heather.

Part VI

Episode: 2x06 | Airdate: Sep 5, 2018

Part VI

Vera reveals Mosswood's past to Ambrose, leading to a turn in Julian's case.

Part VII

Episode: 2x07 | Airdate: Sep 12, 2018

Part VII

Heather and Ambrose search for Julian.

Part VIII

Episode: 2x08 | Airdate: Sep 19, 2018

Part VIII

Heather and Ambrose continue their search for Julian as Marin's past is unraveled.

Season 3

Part I

Episode: 3x01 | Airdate: Feb 6, 2020

Part I

Detective Ambrose investigates a tragic yet suspicious car accident on the outskirts of Dorchester.

 

Part II

Episode: 3x02 | Airdate: Feb 13, 2020

Part II

With the baby due in a week, Jamie begins to crack. He relives memories of his and Nick's disturbing relationship before the fateful crash. Ambrose finds some CCTV footage that convinces him things are not as they seem. The gloves come off between Jamie and Ambrose. A freshly dug grave poses more questions.

Part III

Episode: 3x03 | Airdate: Feb 20, 2020

Part III

Ambrose investigates Jamie's past; Leela gives birth as Jamie's anxiety reaches a breaking point.

Part IV

Episode: 3x04 | Airdate: Feb 27, 2020

Part IV

Ambrose pursues Jamie through New York City and tries to prevent another homicide.

Part V

Episode: 3x05 | Airdate: Mar 5, 2020

Part V

Ambrose urges the NYPD to investigate Jamie for a new crime; Jamie struggles to salvage his life.

Part VI

Episode: 3x06 | Airdate: Mar 12, 2020

Part VI

Jamie pays Sonya a surprise visit; Ambrose goes to extreme lengths to get a confession.

Part VII

Episode: 3x07 | Airdate: Mar 19, 2020

Part VII

After a major turn in the case, Ambrose's tactics are scrutinized.

Part VIII

Episode: 3x08 | Airdate: Mar 26, 2020

Part VIII

Jamie seeks vengeance, putting him on a collision course with Ambrose.

Season 4

Part I

Episode: 4x01 | Airdate: Oct 13, 2021

Part I

Ambrose visits the town of Clark Harbor for a getaway and finds himself at the centre of a tragedy.

Part II

Episode: 4x02 | Airdate: Oct 20, 2021

Part II

A new suspect leads the investigation into an ongoing feud between the Lams and the Muldoons.

Part III

Episode: 4x03 | Airdate: Oct 27, 2021

Part III

Ambrose heads to the mainland to learn more about Percy's past and uncovers dark family secrets.

Part IV

Episode: 4x04 | Airdate: Nov 3, 2021

Part IV

When the Muldoons push to close the investigation, Ambrose refuses, pushing Sonya to the brink.

Part V

Episode: 4x05 | Airdate: Nov 10, 2021

Part V

Ambrose discovers the source of Percy's ritualistic practices and dives deeper into her past.

Part VI

Episode: 4x06 | Airdate: Nov 17, 2021

Part VI

A shocking new crime further rattles the town of Clark Harbor; Ambrose and Meg team together.

Part VII

Episode: 4x07 | Airdate: Nov 24, 2021

Part VII

Unsure whom to trust, Ambrose hunts down his pursuers.

Part VIII

Episode: 4x08 | Airdate: Dec 1, 2021

Part VIII

Ambrose exposes the secret that threw Percy's life off course, setting off widespread consequences.

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