A nighttime emergency call from a moving car alerts the police in Carinthia: "Eisner, BKA Vienna, service number 318-12-58. Need support!" A short time later, Lieutenant Colonel Moritz Eisner is found seriously wounded by a shot to the head and motionless behind the wheel of his car in a quarry. When he wakes up in the intensive care unit, he has no idea what has happened. He suffers from "retrograde amnesia", which blocks out the traumatic experience itself. A fatal consequence of the gunshot wound.

At Chef André Brauer's Viennese gourmet restaurant "Efeukron," knives are sharpened every day—literally for cooking, but also proverbially for each other. While the well-heeled clientele dines in refined style, a toxic working atmosphere and military morals prevail in Brauer's kitchen: If someone in the "brigade" falls, the next person in the hierarchy moves up!

When the egomaniacal boss is found stabbed to death in front of his home after a drinking session with his team and without his wife Alicia present, Bibi Fellner and her colleague Moritz Eisner search among the staff for the murder weapon and the perpetrator.