The third installment follows Detective Harry Ambrose as he begins a routine investigation of a tragic car accident on the outskirts of Dorchester in upstate New York. What Ambrose later uncovers is a hidden crime that pulls him into the most dangerous and disturbing case of his career. In the wake of the investigation, Jamie, an upstanding Dorchester resident and expectant father involved in the accident, looks to Ambrose for support. When Jamie's old college friend, Nick begins to insert himself into the case, it becomes clear there's more to the tragedy than meets the eye.

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

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.

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.