Bax and Pirmin track a killer to the Christ Roi statue high above the valley where they witness a strange ceremony of a sect. Valmira becomes the target of Gerda and Juni comes to the Police Station with a mysterious key.
Bax and Pirmin cannot prevent the countdown to the explosion of the dam wall. With the latest technology, huge guns and a superhuman effort, the Tschuggers try to stop the catastrophe. Will they save the Valais from the end of the world?
The police believe that Pirmin murdered his father-in-law. Gerda, the actual perpetrator, wants to get the explosive key from Bax - no matter what the cost. Bax is handcuffed and cannot defend himself and Valmira is in mortal danger.
A confrontation on the Simplon escalates and shots are fired. Possible victim: police trainee Smetterling. Bax makes his mark with a primary school class. Instead of teaching traffic behavior, he tells cool cop stories.
A bloodbath on the Simplon Pass causes a large contingent of Valais police. Bax, who is forced to do cleaning work, secretly goes on a manhunt and hits on federal police officer Annette.