A mysterious stranger leaves a woman's corpse on the doorstep of Chief Inspector Ann Kathrin Klaasen’s home in East Frisia. This grim discovery marks the beginning of a chilling series of events that claims more victims. The first body belongs to an elderly woman whom the killer cruelly allowed to die of thirst. As Ann Kathrin and her team delve into the investigation, they uncover unsettling secrets and race against time to stop the murderer before more lives are lost. Tension builds as personal and professional boundaries blur, challenging Ann Kathrin to her core.