[Gentle Mother] While Harrow investigates the deaths of a mother and son in a car accident, the mystery of Robert Quinn's disappearance escalates into a homicide investigation.

[Sins of the Father] Nichol's carries out surveillance on Stephanie after she leaves Quinn a threatening voicemail. Then, after the skull from the river bones body is discovered, a positive identity is finally made. Meanwhile, Harrow investigates the suspicious death of a student from his old high school.

A suspicious death at a nursing home causes Harrow to reflect on his own crime, as the investigation into Robert Quinn's murder gains momentum.

Harrow deals with his most bizarre autopsy yet, both Dass and Simon finally close in on the truth about who killed Robert Quinn. Season Finale.