When a gruesome body is found splayed out on a mountain pass in the Alps close to the German-Austrian border, two detectives are sent to investigate. For German detective Ellie, this is the first real challenge of her career; while her Austrian counterpart Gedeon seems to have lost any ambitions for his job. Soon, they discover more crime scenes with victims in symbolic poses reminiscent of pagan rituals. It all seems to be part of a larger, sinister plan. Ellie finds herself under increasing pressure to understand the deranged killer's motives so she can stop him. The hunt leads them deeper and deeper into the dark valleys and ancient Alps.