Bax needs to take a break from Valais and therefore decides to open a smoothie kiosk in Bern. Pirmin, now a full-time father, is instead following a case of murder disguised as suicide, while Valmira is on the verge of breaking through, but the catch is around the corner.

Pirmin's investigation turns out to be a complete failure. Bax is in fact too busy saving his colleague Julie from a love scam and also has to face an unexpected tragedy. Meanwhile, Fricker, now bankrupt, causes one of his workers to fall into a deadly trap.

Bax is suspected of murder, but during a prisoner transport he manages to escape together with Juni. The two thus end up in an uninhabited region, finding themselves without water and without escape. For his part, Pirmin instead has to get rid of a corpse, while Valmira realizes that she has been deceived.

Bax and his gang come across Smetterling in the Pfyn woods, where he is hiding and is busy hunting down mafiosi. When the criminals show up, the time of reckoning finally arrives. What the cops don't know, however, is that the criminals have Valmira in their grip.

Valmira lures the mafiosi into an ambush with fatal consequences, while to get to the bottom of a double murder the cops infiltrate the heart of the Swiss secret services. Despite constantly having two Romande policemen on his tail, Pirmin's son will prove fundamental in solving the case.