A frozen corpse has just been discovered at the bottom of a cabin. This is the body of Katie Pine, a teenager who has been missing for several months. Because he had been instructed to investigate the disappearance of this girl, it is John Cardinal, who will conduct the investigations. Against the will of the inspector who prefers to work alone, Lisa Delorme, a detective specialized in financial crimes but a novice in homicide, is appointed to assist him. Cardinal investigates several unresolved cases of missing children, and quickly becomes convinced that murder of Katie Pine was perpetrated by a serial killer...

Cardinal and Delorme attend Todd Curry’s autopsy in Toronto. It’s a stressful balancing act for Delorme, trying to help Cardinal catch a murderer while feeling the pressure from her Special Investigations Sergeant Malcolm Musgrave to ramp up her investigation into her partner. The autopsy confirms Cardinal’s hunch about the connection between the murders of Todd Curry and Katie Pine, and the pair return to Algonquin Bay as Dyson tries to make amends with the community for the botched investigation into Katie Pine’s disappearance. Investigating the case together, Delorme tries to gain Cardinal’s trust to help her investigation. She lucks into an opportunity to tail Cardinal and takes it, against Musgrave’s orders. She discovers that he’s laundering money through a nearby casino – but has Cardinal discovered her as well?

Concerned that Cardinal is onto her, Delorme digs into the reasons behind her secret investigation.

A criminal breaks into Eric and Edie's basement and finds Keith; issues between Cardinal and Delorme threaten their partnership; Cardinal takes risks in the investigation.

Cardinal and Delorme know who killed Woody Baldwin, but now they must find him; Cardinal's daughter visits her mom.

Cardinal realizes he wasn't working alone and may be too late to save his daughter; Delorme has a decision to make when she finds answers.