In the Austrian region Steiermark, a decayed female body is found in a buried wooden box. When the victim is identified as Malica, Gedeon senses the Krampus Killer has struck again. At first, nobody shares his suspicion. But his reinvigorated eagerness convinces Ellie to pick up an unofficial investigation on their own. They find out that the Macedonian victim, Malica, has been reported missing back home.

With a fifth woman within the killer’s grasp, it’s a race against the clock to unveil the murderer’s identity. Both Gedeon and Ellie battle to hide their struggles as their prime suspect slips through the pair’s fingers.

Determined to stop the killer, Gedeon and Ellie believe they’ve found the key to bringing the whole case to a close. But when the pieces don’t quite add up, Ellie pushes further, revealing shocking truths about her partner and friend.

After a fourth body turns up, Ellie and Gedeon’s investigation leads them to a secretive and elite hunting club. But when the members rebuff police attention, the pair are forced to take unethical measures as they zero in on the killer.

After more than a year of silence, the killer strikes again. But when an outsider throws Yela and Gedeon’s investigation off track, it comes with serious repercussions. Undeterred, Yela takes her hunt dangerously close to the killer.

When the international press conference on the bomb attack gets interrupted, everybody suspects that something major must have occurred: A man wearing a Krampus mask has been shot during a gunfight with the police. It looks like he's the sought-after Krampus Killer. Neither his superiors nor politicians or press want to believe Gedeon's theory that this must be a copycat riding the real killer's coattails. The general demand for a success after months of fear and mayhem is simply too great.

In a joint effort with cultist Brunner, Ellie and Gedeon try to set a trap for the killer. For this plan to work, they have to overstep legal boundaries. Trying to gain the trust of the killer, they feign a copycat murder, hoping their target would be lured into reaching out to Brunner. Meanwhile, Ellie has started an affair with her superior, whereas Gedeon has been haunted by his shady past as a corrupt narcotics cop.

Ellie and Gedeon are working together again, but in secret Gedeon is looking for the artist Oskar Koschlick. After another murder, Ellie receives an important clue from journalist Charles Turek.

Gedeon wakes from a coma only to receive unwelcome news from his medical team. Meanwhile, Ellie struggles to hide the extent of her trauma. A new case comes in from Austrian investigators—prompting Ellie to pass it to new colleague Yela.

A burned woman's body is found in Austria. Instead of Ellie, her new colleague becomes a liaison officer in the German-Austrian Soko. Gedeon distrusts his colleague Rafael Lutz.

The murder of her colleague Yela Antic does not leave Ellie alone: she wants to call Gedeon to account for the theft of the murder weapon. Meanwhile, Gedeon delves more and more into his past.

One year on from the events of the Krampus case, junior police officer Yela Antic finds herself working under the guidance of Ellie Stocker.

Another murder points to a pattern - the perpetrator profile fits the main suspect. At the Gössen construction site, activists and police fight each other. Gedeon comes across a legendary figure.

A frozen body is found on the boundary stone right on the Austro-German border, as if propped up for some pagan ritual. Shortly after the disparate investigation duo, police inspector Gedeon Winter from Austria and commissioner Ellie Stocker from Germany, have joined up on the case. The killer has sent audio messages to the press. The unsettling recording from the victim taken before her death, as well as intricate elements of the crime, make the investigators suspect this murder is merely the beginning of a greater scheme.