The Wolfratshausen police team, along with many other guests, celebrates Anja Licht's 25-year service anniversary. Afterwards, everyone experiences a complete blackout. Staller wakes up next to a dead doctor. Sonja and Riedl try to narrow down the circle of suspects. Hubert and Staller want to quickly make a small purchase for Anja Licht's upcoming anniversary celebration in the shop of the district hospital, when they stumble upon the body of heart specialist Dr. Sebastian Hartmann. Apparently, he was knocked down with a fire extinguisher and drowned in the fire-fighting foam. Anja is not thrilled about the discovery of the body, as she was expecting the hospital's administrative director Horst Greiner and the head of the heart clinic Vera Muhltaup to attend the celebration, along with the entire police station. What was planned as a nice get-together turns into a supposed drunken binge.