After spending the night purging his feelings about Sadie's work on the force, Mike stumbles into the station and tells Sabina and Samuel of Ivan's drunken confession the night before. Meanwhile, Ivan awakens to find Miro and his men in the upstairs washroom with Eva who has been raped and beaten. When Ivan confesses to Miro he sold him out to the cops, Miro threatens to shoot Eva if Ivan doesn't show him where Katya's body is buried so he can destroy the evidence.

Mike questions Ivan about Katya's disappearance; Ivan confesses his crime to Miro.

Mike suspects Miro is involved in a gang war with the Chinese, and suggests to Sabina that they use Ivan to get information on Miro.

Mike Sweeney is face to face with his worst fear - his dark secrets are about to come out while Ray Prager spins violently out of control.

Still consumed by grief, Mike tries to lay blame on Ivan for Audrey's death but the autopsy confirms he was not responsible. As Maddie continues to take the reins with baby Charlie, appointing Ivan as godfather, Sadie is riddled with anxiety over her own pregnancy and her father's inability to comfort the family as they grieve Audrey's passing. Meanwhile, Ivan sets Miro up to take the fall for Katya's death and informs Mike that he found her wedding rings in Miro's car. Frustrated, Mike pushes Ivan to find out where Miro is hiding the drugs he lifted off the Chinese.

Evidence mounts against Ray Prager and Detective Sweeney brings him in for questioning. Before long it's Sweeney who's under suspicion as Prager weaves a net of suspicion around his old rival.

Mike Sweeney has been promoted to a new position as Homicide Detective. His family has been split by serial killer Ray Prager, who is in lockdown after killing two women and traumatizing (possibly raped) Mike's daughter, Sadie. Meanwhile, at work, Mike is assigned a case of a possible homicide of a baby and takes it to forensic psychiatrist, Pen Verrity to help him understand how the murder happened.

Mike Sweeney has moved his family to Durham County after his partner was killed. His new neighbor, Ray Prager, who is his old nemesis from high school. Sadie is trying to fit in at school, while wanting to be like her father and dealing with the illness of her mother. Ray Jr. wants to be something that his father doesn't approve of.

Mike and Tom take a closer look into Bonnie Verrity's death against Roxy's orders. Meanwhile Pen and Jonathan Verrity's fight over custody of Mark comes to a head. Sadie worries about testifying in Ray's upcoming trial and beings an investigation into her father when Ray tells her about an old secret about him.

Things come to a head for everyone in Durham County. Mike tries to convince his daughter that he did not murder Lissie; Pen tries to convince Mike that she did not drown her daughter; Ray tries to convince Pen that he is not a murderer. Ray Jr. and Sadie butt heads over Rays trial. Audrey tries to reconnect her family. Tom tries to continue the investigations despite Mike and Glenns efforts to cover themselves. Jonathan awaits the return of his son from his potentially murderess wife. Some will cry and some will die in the shocking season finale.