Durham County

Newly promoted homicide detective Mike Sweeney struggles to keep his head above water. His family has been torn apart by serial killer Ray Prager, who's now in lockdown after murdering two women and traumatizing Mike's teenage daughter Sadie. Meanwhile, at work, Mike brings on forensic psychiatric Pen Verrity to help him understand the what seems to be a homicide involving the death of a baby.

Mike discovers that Elodie is not a murderer; Mike tries to deal with his tragic mistake; Internal Affairs and a reporter scrutinize Mike's actions.

The emetic that Pen gave Audrey caused more harm than Pen anticipated; Pen dispenses with the spiked chocolates, happy to find her bond with Mike has grown stronger.

Jonathan's assault on Pen encourages Mike to push further with the investigation; Mike needs to exhume Bonnie's body.

Mike believes that Jonathan murdered Molly; Sadie re-enacts what happened between her and Ray at the farm.

Tom arrives at the farm, responding to Sadie's frantic call for help; Sadie tells Tom that Mike and Ray murdered Lissie there.