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

Ambrose looks into Jamie and Nick's relationship before the crash. Jamie begins to unravel.

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

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

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

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

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

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

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

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

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

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

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

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

Heather and Ambrose search for Julian.

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

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

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

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

With Ambrose's help, Cora struggles to recover missing memories, which lead Ambrose to a new suspect.

After a body is discovered in the woods, the investigation into Cora's past deepens.

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

Cora finally remembers the night in question.

Cora's fate is determined.