Four individuals wearing animal masks post a video online claiming responsibility for the tanker Saga and Martin are investigating. Deaths are reported of people eating poisoned food. Are the cases connected?

As the Internal Affairs investigation continues over the death of Saga's mother, the pressure on her becomes intense. Saga, Henrik and John receive new leads when it becomes clear a potential suspect in the mysterious serial killings is actually a victim.

A captive Jeanette's whereabouts are located by Freddie using a tracking device and, with all resources being utilised to investigate the kidnapping, Saga is brought back from suspension to help Henrik follow a tip on who is behind the abduction.

Rasmus has discovered Freddie's abandoned helicopter in a disused concrete factory and is told to wait for back-up.