A dignified dinner on Lake Lucerne: Lucerne's business, political and social elite - and right in the middle is Reto Flückiger (Stefan Gubser), who reluctantly accompanies his girlfriend Eveline (Brigitte Beyeler) to this illustrious occasion. When Flückiger noticed that something was wrong on the steamer, it was already too late: Flashes of light, smoke, broken windows, a dead captain - panic broke out on board. Everything points to an attack. Flückiger and Liz Ritschard (Delia Mayer) follow the trail of passenger Bernhard Ineichen (Martin Hug), who apparently disembarked shortly before the attack. The disappeared is a well-known cantonal councillor.
Is the man the perpetrator or was he himself a victim of the attack? And why can't Flückiger shake the feeling of being watched all the time? While Corinna Haas (Fabienne Hadorn) is analyzing cell phone pictures of the passengers, the police are increasingly having trouble with the alternative news portal "Veritas News". Its shady operator apparently has more information about what is happening on board than he wants to admit. He skilfully drives the investigators in front of him and indulges in wild speculations about the course of events.
Or is the portal actually in the process of uncovering a hard-nosed arms deal conspiracy that the Lucerne establishment wants to keep secret at all costs? And in the end does Eugen Mattmann (Jean-Pierre Cornu), Flückiger's boss, have anything to do with it? In their last case, the two Lucerne investigators get caught up in a seemingly impenetrable thicket of murder, misinformation and intrigues at the highest levels.