在德国 - 奥地利边境,在山口上发现了尸体。德国调查当局正派遣Traunstein的年轻专职委员Ellie Stocker ,对她来说这是她职业生涯中的第一个重大挑战。但她的奥地利同行,愤世嫉俗且不那么忠诚的检查员Gedeon Winter,最初对合作兴趣不大。 一旦找到进一步的象征性排列的尸体,很明显这是一个连环罪犯。与他的受害者一起,他留下了一个信息。红色的季节来了,并将自己定型为Krampus,他必须为了他们的罪而惩罚社会。Stocker和Winter阻止罪犯的压力增加了。在他们的调查中,两名调查人员深入探究了黑暗的山谷,该地区的古老习俗以及凶手的妄想世界。When a gruesomely staged body is found, propped up 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; her Austrian counterpart Gedeon though seems to have lost any ambitions in his job. Very soon, they discover more crime scenes with symbolically posed victims, reminiscent of pagan rituals. It all seems to be part of a bigger, sinister plan. Ellie finds herself under increasing pressure to understand the deranged killer's motives so she can stop him. The hunt leads them ever deeper in the dark valleys and archaic Alpine customs - and the paranoid world of the killer.